REGIONAL SUMMARY
Arbenz, J.K., 1984, A structural cross section through the Ouachita Mountains of western Arkansas, in Stone, C.G., and Haley, B.R., A guidebook to the geology of the central and southern Ouachita Mountains, Arkansas: Arkansas Geological Commission Guidebook 84-2, p. 76-85.
_______1989, The Ouachita systems, in Balley, A.W., and Palmer, A.R., eds., The geology of North America-An overview: Geological Society of America, v. A, p. 371-396.
Cederstrom, D.J., Boswell, E.H., and Tarver, G.R., 1979, Summary appraisals of the nations's ground-water resources-South Atlantic-Gulf region: U.S. Geological Survey Professional Paper 813-O, 35 p.
Fenneman, N.M., 1938, Physiography of eastern United States: McGraw-Hill Book Company, 691 p.
Fenneman, N.M., and Johnson, D.W., 1946, Physical divisions of the United States: U.S. Geological Survey, scale 1:7,000,000, 1 sheet.
Fisk, H.N., McFarland, Edward, Jr., Kolb, C.R., and Wilbert, L.J., 1954, Sedimentary framework of the modern Mississippi delta: Journal of Sedimentary Petrology, v. 24, no. 2, p. 76-99.
Gebert, W.A., Graczyk, D.J., and Krug, W.R., 1987, Average annual runoff in the United States, 1951-80: U.S. Geological Survey Hydrologic Investigations Atlas HA-710, scale 1:7,500,000, 1 sheet.
Gordon, Mackenzie, Jr., and Stone C.G., 1977 Correlation of the Carboniferous rocks of the Ouachita Trough with those of the adjacent foreland, in Symposium on the Geology of the Ouachita Mountains-Stratigraphy, sedimentology, petrography, tectonics, and paleontology: Arkansas Geological Commission, v. 1, p. 70-91.
Haley, B.R., Glick, E.E., Bush, W.V., Clardy, B.F., Stone, C.G., Woodward, M.B., and Zachry, D.L., 1976, Geologic Map of Arkansas: U.S. Geological Survey, 1 sheet, scale 1:500,000.
Hanna, Marcus, 1958, Salt-dome structures: Gulf Oil Corporation Manual, 45 p.
Hosman, R.L., and Weiss, J.S., 1991, Geohydrologic units of the Mississippi embayment and Texas coastal uplands aquifer systems, south-central United States: U.S. Geological Survey Professional Paper 1416-B, 19 p.
Imes, J.L, 1990, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-B, scale 1:750,000, 1 sheet.
King, P.B., and Beikman, H.M., 1974, Geologic map of the United States: U.S. Geological Survey, scale 1:2,500,000, 3 sheets.
Mesko, T.O., Williams,T.A., Ackerman, D.J.,and Williamson, A.K., 1990, Ground-water pumpage from the Gulf Coast aquifer systems, 1960-1985, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 89-4180, 177 p.
Solley, W.B., Merk, C.F., and Pierce, R.R., 1988, Estimated use of water in the United States in 1985: U.S. Geological Survey Circular 1004, 82 p.
Stone, C.G., and Haley, B.R., 1986, Sedimentary and igneous rocks of the Ouachita Mountains of Arkansas: Arkansas Geological Commission Guidebook 86-3, 100 p.
Terry, J.E., Hosman, R.L., and Bryant, C.T., 1979, Summary appraisals of the Nation's ground-water resources-Lower Mississippi region: U.S. Geological Survey Professional Paper 813-N, 41 p.
U.S. Geological Survey, 1985, National water summary, 1984-Hydrologic events, selected water-quality trends and ground-water resources: U.S. Geological Survey Water-Supply Paper 2275, 467 p.
_______1986, National water summary, 1985-Hydrologic events and surface-water resources: U.S. Geological Survey Water-Supply Paper 2300, 506 p.
_______1988, National water summary, 1986-Hydrologic events and ground-water quality: U.S. Geological Survey Water-Supply Paper 2325, 560 p.
_______1990, National Water Summary, 1987-Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, 553 p.
Williamson, A.K., Grubb, H.F., and Weiss, J.S., 1990, Ground-water flow in the Gulf Coast aquifer systems, south-central United States-A preliminary analysis: U.S. Geological Survey Water-Resources Investigations Report 89-4071, 124 p.
Wilhelm, Oscar and Ewing, Maurice, 1972, Geology and history of the Gulf of Mexico: Geological Society of America Bulletin, v. 83, no. 3, p. 575-600.
SURFICIAL AQUIFER SYSTEM
Ackerman, D.J., 1989a, Hydrogeology of the Mississippi River Valley alluvial aquifer, south-central United States-A preliminary assessment of the regional flow system: U.S. Geological Survey Water-Resources Investigations Report 88-4028, 74 p.
_______1989b, Potentiometric surfaces of the Mississippi River Valley alluvial aquifer in eastern Arkansas, spring 1972 and 1980: U.S. Geological Survey Water-Resources Investigations Report 88-4075, scale 1:500,000, 1 sheet.
_______1996, Hydrology of the Mississippi River Valley alluvial aquifer, south-central United States: U.S. Geological Survey Professional Paper 1416-D, 56 p.
Allen, J.R.L., 1964, A review of the origin and characteristics of Recent alluvial sediments: Sedimentology, v. 5, no. 2, p. 89-91.
Bedinger, M.S., Emmett, L.F., and Jeffery, H.G., 1963, Ground-water potential of the alluvium of the Arkansas River between Little Rock and Fort Smith, Arkansas: U.S. Geological Survey Water-Supply Paper 1669-L, 29 p.
Bedinger, M.S., and Jeffery, H.G., 1964, Ground-water in the lower Arkansas River Valley, Arkansas: U.S. Geological Survey Water-Supply Paper 1669-V, 17 p.
Boswell, E.H., Cushing, E.M., and Hosman, R.L., 1968, Quaternary aquifers in the Mississippi Embayment with a discussion on Quality of the water, by H.G. Jeffery: U.S. Geological Survey Professional Paper 448-E, 15 p.
Broom, M.E., and Lyford, F.P., 1981, Alluvial aquifer of the Cache and St. Francis River basins, northeastern Arkansas: U.S. Geological Survey Open-File Report 81-476, 48 p.
Bryant, C.F., Lyford, F.P., Stafford, K.L., and Johnson, D.M., 1983, Hydrology of Area 42, Western Region, Interior Coal Province, Arkansas: U.S. Geological Survey Water-Resources Investigations Open-File Report 82-636, 62 p.
Cordova, R.M., Reconnaissance of the ground-water resources of the Arkansas Valley region, Arkansas: U.S. Geological Survey Water-Supply Paper 1669-BB, 33 p.
Dalsin, G.J., 1978, The Mississippi River Valley alluvial aquifer in Mississippi: U.S. Geological Survey Water-Resources Investigations 78-106, 2 sheets.
Fisk, H.N., 1944, Geological investigation of the alluvial aquifer of the lower Mississippi River: U.S. Department of the Army, Mississippi River Commission, 78 p.
Fisk, H.N., 1951, Loess and Quaternary geology of the lower Mississippi River: Journal of Geology, v. 59, p. 333-356.
Fitzpatrick, D.J., 1985, Occurrence of saltwater in the alluvial aquifer in the Boeuf-Tenas basin, Arkansas: U.S. Geological Survey Water-Resources Investigations Report 85-4029, scale 1:126,720, 1 sheet.
Gandl, L.A., 1982, Characterization of aquifers designated as potential drinking water sources in Mississippi: U.S. Geological Survey Water-Resources Investigations Open-File Report 81-550, 90 p.
Grubb, H.F., in press, Summary of hydrology of the regional aquifer systems-Gulf Coastal Plain, south-central United States: U.S. Geological Survey Professional Paper 1416-A.
Hosman, R.L., and Weiss, J.S., 1991, Geohydrologic units of the Mississippi embayment and Texas coastal uplands aquifer systems, south-central United States: U.S. Geological Survey Professional Paper 1416-B, 19 p.
Krinitzsky, E.L., and Wire, J.C., 1964, Ground water in alluvium of lower Mississippi Valley (upper and central areas): U.S. Department of the Army, Corps of Engineers, Waterways Experiment Station Technical Report 3-658, v. 1 and 2, 400 p.
Lovelace, J.K., 1994, Water requirements for crawfish farming at selected sites in south-central Louisiana, 1992-94: Louisiana Department of Transportation and Development Water Resources Special Report 8, 12 p.
Ludwig, A.H., 1972, Water resources of Hempstead, Lafayette, Little River, Miller, and Nevada Counties, Arkansas: U.S. Geological Survey Water-Supply Paper 1998, 41 p.
Mahon, G.L., and Ludwig, A.H., 1990, Simulation of ground-water flow in the Mississippi River Valley alluvial aquifer in eastern Arkansas: U.S. Geological Survey Water-Resources Investigations Report 89-4145, 26 p.
Mesko, T.O., Williams, T.A., Ackerman, D.J., and Williamson, A.K., 1990, Ground-water pumpage from the Gulf Coast aquifer systems, 1960-1985, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 89-4180, 177 p.
Newcome, Roy, Jr., 1960, Ground-water resources of the Red River Valley alluvium in Louisiana: Louisiana Department of Conservation Water Resources Pamphlet 7, 21 p.
Pettijohn, R.A., 1988, Dissolved-solids concentrations and primary water types, Gulf Coast aquifer systems; south-central United States: U.S. Geological Survey Hydrologic Investigations Atlas HA-706, scale 1:5,000,000, 2 sheets.
Pettijohn, R.A., Busby, J.F., and Beckman, J.D., 1992, Properties and chemical constituents in ground water from the Mississippi River Valley alluvial aquifer and Permeable zone A (Holocene-Upper Pleistocene deposits), coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Water-Resources Investigations Report WRIR 91-4149, scale 1:2,500,000, 5 sheets.
Plebuch, R.O., and Hines, M.S., 1969, Water resources of Clark, Cleveland, and Dallas Counties, Arkansas: U.S. Geological Survey Water-Supply Paper 1879-A, 32 p.
Rosenshein, J.S., 1988, Region 18, Alluvial valleys, in Back, William, Rosenshein, J.S., and Seaber, P.R., eds., Hydrogeology: Geological Society of America, The Geology of North America, v. O-2, p. 165-175.
Seanor, R.C., and Smoot, C.W., 1995, Louisiana ground-water map number 6: Potentiometric surface, (1990), and water level changes, 1974-90, of the Mississippi River alluvial aquifer in northeastern Louisiana: U.S. Geological Survey Water-Resources Investigations Report 95-4146, scale 1:7,920, 2 sheets.
Smoot, C.W., and Martin, Angel Jr., 1991, Generalized potentiometric surfaces of the Red River alluvial aquifer-Pool 1, Red River waterway area, central Louisiana: U.S. Geological Survey Water-Resources Investigations Report 91-4109, scale 1:62,500, 7 sheets.
Sumner, D.M, and Wasson, P.E., 1984, Geohydrology and simulated effects of large ground-water withdrawals on the Mississippi River alluvial aquifer in northwestern Mississippi: U.S. Geological Survey Open-File Report 84-822, 82 p.
Turcan, A.N., and Meyer, R.R., 1962, Alluvial aquifer in northeastern Louisiana-A large source of water: U.S. Geological Survey Water-Supply Paper 1619-V, 28 p.
U.S. Geological Survey, 1990, National water summary, 1987-Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, 553 p.
Wasson, B.E., 1980, Water-level map of the Mississippi delta alluvium in northwestern Mississippi, September 1980: Mississippi Department of Natural Resources, Water Resources Map 80-1, scale 1:500,000, 1 sheet.
Williamson, A.K., Grubb, H.F., and Weiss, J.S., 1990, Ground-water flow in the Gulf Coast aquifer systems, south-central United States-A preliminary analysis: U.S. Geological Survey Water-Resources Investigations Report 89-4071, 124 p.
Whitfield, M.S., Jr., 1975, Geohydrology and water quality of the Mississippi River: Louisiana Department of Public Works Water Resources Technical Report 10, 29 p.
COASTAL LOWLANDS AQUIFER SYSTEM
Boswell, E.H., and Arthur, J.K., 1988, Generalized potentiometric surface of shallow aquifers in southern Mississippi, 1982: U.S. Geological Survey Water-Resources Investigations Report 87-4257, scale 1:500,000, 1 sheet.
Dickinson, George, 1953, Geological aspects of abnormal reservoir pressures in Gulf Coast Louisiana: American Association of Petroleum Geologists Bulletin, v. 37, no. 2, p. 410-432.
Fendick, R.B., Jr., and Nyman, D.J., 1987, Louisiana ground-water map no. 1-Water-level changes of the Chicot aquifer in southwestern Louisiana, spring 1983 to spring 1985: U.S. Geological Survey Water-Resources Investigations Report 86-4348, 2 sheets.
Fisher, W.L., 1969, Facies characterization of Gulf Coast basin delta systems, with some Holocene analogues: Gulf Coast Association of Geological Societies Transactions, v. 19, p. 239-261.
Frazier, D.E., 1967, Recent deltaic deposits of the Mississippi River-Their development and chronology: Gulf Coast Association of Geological Societies Transactions, v. 17, p. 287-315.
Gandl, L.A., 1982, Characterization of aquifers designated as potential drinking water sources in Missouri: U.S. Geological Survey Open-File Report 81-550, 90 p.
Grubb, H.F, in press, Summary of hydrology of the regional aquifer-systems, Gulf Coastal Plain, south-central United States: U.S. Geological Survey Professional Paper 1416-A.
Harder, A.H., 1960, The geology and ground-water resources of Calcasieu Parish, Louisiana: U.S. Geological Survey Water-Supply Paper 1488, 102 p.
Harris, G.D., 1904, Underground waters of southern Louisiana, with discussions of their uses of water supplies and for rice irrigation, by M.L. Fuller: U.S. Geological Survey Water-Supply Paper 101, 98 p.
Huntzinger, T.L., Whiteman, C.D., Jr., and Knochenmus, D.D., 1985, Simulation of ground-water movement in the "1,500- and 1,700-foot" aquifer of the Baton Rouge area, Louisiana: Louisiana Department of Transportation and Development, Office of Public Works Water-Resources Technical Report 34, 52 p.
Kuniansky, E.L., 1989, Geohydrology and simulation of ground-water flow in the "400-foot", "600-foot", and adjacent aquifers, Baton Rouge area, Louisiana: Louisiana Department of Transportation and Development, Office of Public Works Water-Resources Technical Report 49, 90 p.
Jones, P.H., 1969, Hydrology of the Neogene deposits in the northern Gulf of Mexico Basin: Louisiana Water Resources Research Institute Bulletin GT-2,105 p.
Jones, P.H., Hendricks, E.L., Irelands, Burge, and others, 1956, Water resources of southwest Louisiana: U.S. Geological Survey Water-Supply Paper 1364, 460 p.
Martin, Angel, Jr., and Whiteman, C.D., Jr., 1985a, Map showing generalized potentiometric surface of aquifers of Pleistocene age, southern Louisiana, 1980: U.S. Geological Survey Water-Resources Investigations Report 84-4331, scale 1:500,000, 1 sheet.
-------1985b, Map showing generalized potentiometric surface of the Evangeline and equivalent aquifers in Louisiana, 1980: U.S. Geological Survey Water-Resources Investigations Report 84-4359, scale 1:500,000, 1 sheet.
_______1986, Generalized potentiometric surface of the Catahoula aquifer in central Louisiana, 1980: U.S. Geological Survey Water-Resources Investigations Report 86-4059, scale 1:500,000, 1 sheet.
_______1989, Geohydrology and regional ground-water flow of the coastal lowlands aquifer system in parts of Louisiana, Mississippi, Alabama, and Florida-A preliminary analysis: U.S. Geological Survey Water-Resources Investigations Report 88-4100, 88 p.
_______1990, Calibration and sensitivity analysis of a ground-water flow model of the coastal lowlands aquifer system in parts of Louisiana, Mississippi, Alabama, and Florida: U.S. Geological Survey Water-Resources Investigations Report 89-4189, 54 p.
_______1991, Hydrology of the coastal lowlands aquifer system in parts of Alabama, Florida, Louisiana, and Mississippi: U.S. Geological Survey Open-File Report 91-72, 115 p.
Martin, Angel, Jr., Whiteman, C.D., Jr., and Becnel, M.J., 1988, Generalized potentiometric surfaces of the upper and lower Jasper and equivalent aquifers in Louisiana, 1984: U.S. Geological Survey Water-Resources Investigations Report 87-4139, scale 1:500,000, 2 sheets.
Mesko, T.O., Williams,T.A., Ackerman, D.J., and Williamson, A.K., 1990, Ground-water pumpage from the Gulf Coast aquifer systems, 1960-1985, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 89-4180, 177 p.
Meyer, R.R., and Turcan, A.N., Jr., 1955, Geology and ground-water resources of the Baton Rouge area, Louisiana: U.S. Geological Survey Water-Supply Paper 1296, 138 p.
Morgan, C.O., 1961, Ground-water conditions in the Baton Rouge area, 1954-59, with special reference to increased pumpage: Louisiana Department of Conservation, Louisiana Geological Survey, and Louisiana Department of Public Works Water-Resources Bulletin 2, 78 p.
_______1963, Ground-water resources of East Feliciana and West Feliciana Parishes, Louisiana: Louisiana Department of Public Works, 58 p.
Nyman, D.J., 1984, The occurrence of high concentrations of chloride in the Chicot aquifer system of southwestern Louisiana: Louisiana Department of Transportation and Development, Office of Public Works, Water-Resources Technical Report 33, 75 p.
Nyman, D.J., and Fayard, L.D., 1978, Ground-water resources of Tangipahoa and St. Tammany Parishes, southeastern Louisiana: Louisiana Department of Transportation and Development, Office of Public Works Water Resources Technical Report 15, 76 p.
Pettijohn, R.A., 1988, Dissolved-solids concentrations and primary water types, Gulf Coast aquifer systems, south-central United States: U.S. Geological Survey Hydrologic Investigations Atlas HA-706, scale 1:5,000,000, 2 sheets.
Pettijohn, R.A., Busby, J.R., and Beckman, J.D., 1992, Properties and chemical constituents in ground water from the Mississippi River Valley alluvial aquifer and Permeable zone A (Holocene-upper Pleistocene deposits), south-central United States: U.S. Geological Survey Water Resources Investigations Report 91-4149, scale 1:250,000, 5 sheets.
_________1993, Properties and chemical constituents in ground water from Permeable zone D (middle Miocene deposits), coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Water-Resources Investigations Report, 92-4105, 1:2,500,000, 5 sheets.
Pettijohn, R.A., Busby, J.F., and Cervantes, M.A., 1993, Properties and chemical constituents in ground water from Permeable zone C (lower Pliocene-upper Miocene deposits), coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 91-4151, scale 1:2,500,000, 5 sheets.
Pettijohn, R.A., Busby, J.F., and Layman, T.B., 1993a, Properties and chemical constituents in ground water from Permeable zone E (lower Miocene-upper Oligocene deposits), coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 92-4103, scale 1:2,500,000, 5 sheets.
_______1993b, Properties and chemical constituents in ground water from Permeable zone B (lower Pleistocene-upper Pliocene deposits), coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 91-4152, scale 1:2,500,000, 5 sheets.
Pettijohn, R.A., Weiss, J.S., and Williamson, A.K., 1988, Distribution of dissolved-solids concentrations and temperature in ground water of the Gulf Coast aquifer systems, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 88-4082, scale 1:2,500,000, 5 sheets.
Rollo, J.R., 1960, Ground water in Louisiana: Louisiana Geological Survey Water Resources Bulletin 1, 84 p.
_______1966, Ground-water resources of the Greater New
Orleans area, Louisiana: Louisiana Department of Conservation, Louisiana Geological Survey, and Louisiana Department of Public Works Water-Resources Bulletin 9, 69 p.
Torak, L.J., and Whiteman, C.D., Jr., 1982, Applications of digital modeling for evaluating the ground-water resources of the "2,000-foot" sand of the Baton Rouge area, Louisiana: Louisiana Department of Transportation and Development, Office of Public Works Water Resources Technical Report 27, 87 p.
Tomaszewski, D.J., 1988, Ground-water hydrology of Livingston, St. Helena, and parts of Ascension and Tangipahoa Parishes, southeastern Louisiana: Louisiana Department of Transportation and Development, Water-Resources Technical Report 43, 65 p.
Turcan, A.N., Wesselman, J.B., and Kilburn, Chabot, 1966, Interstate correlation of aquifers, southwestern Louisiana and southeastern Texas: U.S. Geological Survey Professional Paper 550-D, p. D231-D236.
U.S. Geological Survey, 1990, National water summary, 1987-Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, 553 p.
Weiss, J.S, 1992, Geohydrologic units of the coastal lowlands aquifer system, south-central United States: U.S. Geological Survey Professional Paper 1416-C, 32 p.
Whiteman, C.D., Jr., 1979, Saltwater encroachment in the "600-foot" and "1,500-foot" sands of the Baton Rouge area, Louisiana, 1966-78, including a discussion of saltwater in other sands: Louisiana Department of Transportation and Development, Office of Public Works Water Resources Technical Report 19, 49 p.
Whitfield, M.S., Jr., 1975, Geohydrology of the Jasper and Evangeline aquifers of southwestern Louisiana: Louisiana Department of Public Works Water Resources Technical Bulletin 20, 72 p.
Williamson, A.K., Grubb, H.F., and Wiss, J.S., 1990, Ground-water flow in the Gulf Coast aquifer systems, south-central United States-A preliminary analysis: U.S. Geological Survey Water-Resources Investigations Report 89-4071, 124 p.
Zack, A.L., 1971, Ground-water pumpage and related effects, southwestern Louisiana, 1970, with a section of surface-water withdrawals: Louisiana Department of Conservation, Louisiana Geological Survey, and Louisiana Department of Public Works Water-Resources Pamphlet 27, 33 p.
MISSISSIPPI EMBAYMENT AQUIFER SYSTEM
Arthur, J.K., and Taylor, R.E., 1990, Definition of geohydrologic framework and preliminary simulation of ground-water flow in the Mississippi embayment aquifer system, Gulf Coastal Plain, United States: U.S. Geological Survey Water-Resources Investigations Report 86-4364, 97 p.
Baker, R.C., 1955, Arkansas' ground-water resources: Arkansas Geological and Conservation Commission Water-Resources Circular 1, 16 p.
Barker, R.A., and Pernik, Maribeth, 1995, Regional geohydrology and computer-model simulation of deep ground-water flow in the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1410-C, 87 p.
Boswell, E.H., 1963, Cretaceous aquifers of northeastern Mississippi: State of Mississippi Board of Water Commissioners Bulletin 63-10, 202 p.
_______1979, The Coffee Sand and Ripley aquifers in Mississippi: U.S. Geological Survey Water-Resources Investigations Map 78-114, scale 1:500,000, 1 sheet.
Boswell, E.H., Cushing, E.M., Hosman, R.L., 1968, Quaternary aquifers in the Mississippi Embayment, with discussions on Quality of the water by H.G. Jeffery: U.S. Geological Survey Professional Paper 448-E, 15 p.
Boswell, E.H., Moore, G.K., MacCary, L.M., and others, 1965, Cretaceous aquifers in the Mississippi Embayment, with discussions on Quality of the water, by H.G. Jeffery: U.S. Geological Survey Professional Paper 448-C, 37 p.
Brahana, J.V., in press, Hydrology of the McNairy-Nacatoch and adjacent aquifers in the northern Mississippi Embayment: U.S. Geological Survey Water-Resources Investigation Report 96-4108.
Brahana, J.V., and Mesko, T.O., 1988, Hydrogeology and preliminary assessment of regional flow in the Upper Cretaceous and adjacent aquifers in the northern Mississippi Embayment: U.S. Geological Survey Water-
Resources Investigations Report 87-4000, 65 p.
Coleman, J.M., and Gagliano, S.M., 1964, Cyclic sedimentation in the Mississippi River deltaic plain: Gulf Coast Association of Geological Societies Transactions, v. 14, p. 67-80.
Counts, H.B., Tait, D.B., Klein, Howard, and Billingsley, G.A., 1955, Ground-water resources in a part of southwestern Arkansas: Arkansas Geological and Conservation Commission Water Resources Circular 2, 35 p.
Cushing, E.M., 1966, Map showing altitude of the base of fresh water in coastal plain aquifers of the Mississippi Embayment: U.S. Geological Survey Hydrologic Investigation Atlas HA-221, scale 1:1,000,000, 1 sheet.
Cushing, E.M., Boswell, E.H., Speer, P.R., Hosman, R.L., and others, 1970, Availability of water in the Mississippi Embayment: U.S. Geological Survey Professional Paper 448-A, 13 p.
Cushing, E.M., Boswell, E.H., and Hosman, R.L., 1964, General geology of the Mississippi Embayment: U.S. Geological Survey Professional Paper 448-B, 28 p.
Dalsin, G.J., 1978, The Mississippi River Valley alluvial aquifer in Mississippi: U.S. Geological Survey Water-Resources Investigations Report 78-106, 2 sheets.
Edds, Joe, and Fitzpatrick, D.J., 1984, Maps showing the altitude of the potentiometric surface and changes in water levels of the Sparta Sand and Memphis Sand aquifers in eastern Arkansas, Spring 1983: U.S. Geological Survey Water-Resources Investigations Report 84-4265, scale 1:500,000, 1 sheet.
Fisk, H.N., 1944, Geological investigation of the alluvial aquifer of the lower Mississippi River: U.S. Department of the Army, Mississippi River Commission, 78 p.
Gandl, L.A., 1982, Characterization of aquifers designated as potential drinking water sources in Mississippi: U.S. Geological Survey Open-File Report 81-550, 90 p.
Grubb, H.F., 1984, Planning report for the Gulf Coast regional aquifer-system analysis, Gulf of Mexico Coastal Plain, United States: U.S. Geological Survey Water-Resources Investigations Report 84-4291, 30 p.
Grubb, H.F., and Carrillo, R., J.J., 1988, Region 23, Gulf of Mexico Coastal Plain, in Back, William, Rosenshein, J.S., and Seaber, P.R., eds., Hydrogeology: Geological Society ofAmerica, Geology of North America, v. O-2, p. 219-228.
Hosman, R.L., Long, A.T., Lambert, T.W., and others, 1968, Tertiary aquifers in the Mississippi Embayment, with discussions on Quality of the water, by H.G. Jeffery: U.S. Geological Survey Professional Paper 448-D, 29 p.
Hosman, R.L., 1982, Geohydrogeologic framework of the Gulf Coastal Plain: U.S. Geological Survey Hydrologic Investigations Atlas HA-695, scale 1:2,500,000, 2 sheets.
Hosman, R.L., and Weiss, J.S., 1991, Geohydrologic units of the Mississippi embayment and Texas coastal uplands aquifer systems, south-central United States: U.S. Geological Survey Professional Paper 1416-B, 19 p.
Lee, R.W., 1988a, Water-quality for the middle Tertiary aquifer in the Southeastern Coastal Plain of Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Water-Resources Investigations Report 86-4117, scale 1:2,000,000, 2 sheets.
_______1988b, Water-quality maps for the Upper Cretaceous and lower Tertiary aquifer in the Southeastern Coastal
Plain of Mississippi, Alabama, Georgia, South Carolina, and southeastern North Carolina: U.S. Geological Survey Water-Resources Investigations Report 86-4116, scale 1:2,000,000, 2 sheets.,
_______1993, Geochemistry of ground water in the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1410-D, 72 p.
Mahon, G.L., and Ludwig, A.H., 1990, Simulation of ground-water flow in the Mississippi River Valley alluvial aquifer in eastern Arkansas: U.S. Geological Survey Water-Resources Investigations Report 89-4145, 26 p.
Mesko, T.O., Williams,T.A., Ackerman, D.J., and Williamson, A.K., 1990, Ground-water pumpage from the Gulf Coast aquifer systems, 1960-1985, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 89-4180, 177 p.
Miller, J.A., and Renken, R.A., 1988, Nomenclature of regional hydrogeologic units of the Southeastern Coastal Plain aquifer system: U.S. Geological Survey Water-Resources Investigations Report 87-4202, 21 p.
Payne, J.N., 1968, Geohydrologic significance of the lithofacies of the Sparta Sand in Arkansas, Louisiana, Mississippi, and Texas: U.S. Geological Survey Professional Paper 569-A, 17 p.
_______1970, Hydrologic significance of lithofacies of the Cockfield Formation of Louisiana and Mississippi and of the Yegua Formation of Texas: U.S. Geological Survey Professional Paper 569-B, 14 p.
_______1972, Hydrologic significance of lithofacies of the Cane River Formation or equivalents of Arkansas, Louisiana, Mississippi, and Texas: U.S. Geological Survey Professional Paper 569-C, 17 p.
_______1975, Geohydrologic significance of lithofacies of the Carrizo Sand of Arkansas, Louisiana, and Texas and the Meridian Sand of Mississippi: U.S. Geological Survey Professional Paper 569-D, 11 p.
Petersen, J.C., Broom, M.E., and Bush, W.V., 1985, Geohydrologic units of the Gulf Coastal Plain in Arkansas: U.S. Geological Survey Water-Resources Investigations Report 85-4116, 20 p., 9 plates.
Pettijohn, R.A., 1988, Dissolved-solids concentrations and primary water types, Gulf Coast aquifer systems, south-central United States: U.S. Geological Survey Hydrologic Investigations Atlas HA-706, scale 1:5,000,000, 2 sheets.
Pettijohn, R.A., Busby, J.F., and Cervantes, M.A., 1993a, Properties and chemical constituents in ground-water from the middle Claiborne aquifer, Gulf Coast regional aquifer systems, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 92-4104, scale 1:2,500,000, 5 sheets.
_______1993b, Properties and chemical constituents in ground water from the lower Claiborne-upper Wilcox aquifer, Gulf Coast regional aquifer systems, south-central United States: U.S. Geological Survey Water-
Resources Investigations Report 92-4102, scale 1:2,500,000, 5 sheets.
Pettijohn, R.A., Busby, J.F., Layman, T.B., 1993, Properties and chemical constituents in ground-water from the upper Claiborne aquifer, Gulf Coast regional aquifer systems, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 91-4150, scale 1:2,500,000, 5 sheets.
Pettijohn, R.A., Weiss, J.S., and Williamson, A.K., 1988, Distribution of dissolved-solids concentrations and temperature in ground water of the Gulf Coast aquifer systems, south-central United States: U.S. Geological Survey Water-Resources Investigations Report 88-4082, 38 p.
Renken, R.A., 1984, The hydrogeologic framework for the Southeastern Coastal Plain aquifer system of the United States: U.S. Geological Survey Water-Resources Investigations Report 84-4243, 26 p.
_______1996, Hydrogeology of the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1403-B, 101 p.
Renken, R.A., Mahon, G.L., and Davis, M.E., 1989, Hydro-geology of clastic Tertiary and Cretaceous regional aquifers and confining units in the Southeastern Coastal Plain aquifer system of the United States: U.S. Geological Survey Hydrologic Investigations Atlas HA-701, 3 sheets.
Stricker, V.A., Aucott, W.R., Faye, R.E., Williams, J.S, and Mallory, M.J., 1985a, Approximate potentiometric surface for the aquifer unit A2, Southeastern Coastal Plain aquifer system of the United States, prior to development: U.S. Geological Survey Water-Resources Investigations Report 85-4019, scale 1:2,000,000, 1 sheet.
_______1985b, Approximate potentiometric surface for aquifer unit A3, Southeastern Coastal Plain aquifer system of the United States, prior to development: U.S. Geological Survey Water-Resources Investigations Report 85-4031, scale 1:2,000,000, 1 sheet.
Sumner, D.M., and Wasson, B.E., 1984, Geohydrology and simulated effects of large ground-water withdrawals on the Mississippi River Valley alluvial aquifer in northwestern Mississippi: U.S. Geological Survey Open-File Report 84-822, 82 p.
Turcan, A.N., and Meyer, R.R., 1962, Alluvial aquifer in northeastern Louisiana-A large source of water: U.S. Geological Survey Water-Supply Paper 1619-V, 28 p.
U.S. Geological Survey, 1990, National water summary, 1987-Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, 553 p.
Williamson, A.K., Grubb, H.F., and Weiss, J.S., 1990, Ground-water flow in the Gulf Coast aquifer systems, south-central United States-A preliminary analysis: U.S. Geological Survey Water-Resources Investigations Report 89-4071, 124 p.
CRETACEOUS AQUIFERS
Barker, R.A., 1986, Preliminary results of a steady-state model of the Southeastern Coastal Plain aquifer system, in Proceedings of the Southern Regional Ground Water Conference, September 18-19, 1985, San Antonio, Tex.,: Association of Ground Water Scientists and Engineers, Division of the National Water Well Association, p. 315-338.
Barker, R.A., and Pernik, Maribeth, 1995, Regional geohydrology and computer-model simulation of deep ground-water flow in the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1410-C, 87 p.
Boswell, E.H., 1963, Cretaceous aquifers of northeastern Mississippi: State of Mississippi Board of Water Commissioners Bulletin 63-10, 202 p.
_______1977, The Eutaw-McShan aquifer in Mississippi: U.S. Geological Survey Water-Resources Investigations Map 76-134, 2 sheets.
_______1978, The Tuscaloosa aquifer system in Mississippi: U.S. Geological Survey Water-Resources Investigations Map 78-98, 3 sheets.
_______1979, The Coffee Sand and Ripley aquifers in Mississippi: U.S. Geological Survey Water-Resources Investigations Map 78-114, 1 sheet.
Boswell, E.H., Moore, G.K., MacCary, L.M., and others, 1965, Cretaceous aquifers in the Mississippi Embayment, with a discussion on Quality of the water, by H.G. Jeffery: U.S. Geological Survey Professional Paper 448-C, 37 p.
Counts, H.B., Tait, D.B., Klein, Howard, and Billingsley, G.A., 1955, Ground-water resources in a part of southwestern Arkansas: Arkansas Geological and Conservation Commission Water Resources Circular No. 2, 35 p.
Devery, D.M., 1982, Subsurface Cretaceous strata of Mississippi: Mississippi Department of Natural Resources Information Series 82-1, 24 p.
Dolloff, J.H., Rozendal, R.A., Siratovích, E.N., Swain, F.M., Jr., and Woncik, John, 1967, Subsurface Upper Cretaceous stratigraphy of southwestern Arkansas: Gulf
Coast Association of Geological Society Transactions, v. 17, p. 76-104.
Gandl, L.A., 1982, Characterization of aquifers designated as potential drinking water sources in Mississippi: U.S. Geological Survey Open-File Report 81-550, 90 p.
Lee, R.W., 1985a, Geochemistry of ground water in Cretaceous sediments of the Southeastern Coastal Plain of eastern Mississippi and western Alabama: Water Resources Research, v. 21, no. 10, p. 1,545-1,556.
_______1985b, Water-quality maps for selected Cretaceous water-bearing zones in the Southeastern Coastal Plain: U.S. Geological Survey Water-Resources Investigations Report 85-4193, scale 1:2,000,000, 2 sheets.
_______1993, Geochemistry of ground water in the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1410-D, 72 p.
Ludwig, A.H., 1972, Water resources of Hempstead, Lafayette, Little River, Miller, and Nevada Counties, Arkansas: U.S. Geological Survey Water-Supply Paper 1998, 41 p.
Mallory, M.J., 1987, A proposed alternative hypothesis of unstressed flow in the Cretaceous Sand aquifers of Alabama and Mississippi: Hydrological Science and Technology, American Institute of Hydrology, v. 3, no. 1-2, p. 61-66.
_______1993, Hydrology of the Southeastern Coastal Plain aquifer system in eastern Mississippi and western Alabama: U.S. Geological Survey Professional Paper 1410-G, 57 p.
Miller, J.A., and Renken, R.A., 1988, Nomenclature of regional hydrogeologic units of the Southeastern Coastal Plain aquifer system: U.S. Geological Survey Water-Resources Investigations Report 87-4202, 21 p.
Pernik, Maribeth, 1987, Sensitivity analysis of a multilayer, finite-difference model of the Southeastern Coastal Plain regional aquifer system: U.S. Geological Survey Water-Resources Investigations Report 87-4108, 53 p.
Petersen, J.C., Broom, M.E., and Bush, W.V., 1985, Geohydrologic units of the Gulf Coastal Plain in Arkansas: U.S. Geological Survey Water-Resources Investigations Report 85-4116, 20 p., 9 plates.
Renken, R.A., 1984, The hydrogeologic framework for the Southeastern Coastal Plain aquifer system of the United States: U.S. Geological Survey Water-Resources Investigations Report 84-4243, 26 p.
_______1996, Hydrogeology of the Southeastern Coastal Plain aquifer system in Mississippi, Alabama, Georgia, and South Carolina: U.S. Geological Survey Professional Paper 1403-B, 101 p.
Renken, R.A., Mahon, G.L., and Davis, M.E., 1989, Hydro-geology of clastic Tertiary and Cretaceous regional aquifers and confining units in the Southeastern Coastal Plain aquifer system of the United States: U.S. Geological Survey Hydrologic Investigations Atlas HA-701, 3 sheets.
Stricker, V.A., Aucott, W.R., Faye, R.E., Williams, J.S., and Mallory, M.J., 1985, Approximate potentiometric surface for the aquifer unit A4, Southeastern Coastal Plain aquifer system of the United States, prior to development: U.S. Geological Survey Water-Resources Investigations Report 84-4364, scale 1:2,000,000, 1 sheet.
U.S. Geological Survey, 1990, National water summary, 1987-Hydrologic events and water supply and use: U.S. Geological Survey Water-Supply Paper 2350, 553 p.
OZARK PLATEAUS AQUIFER SYSTEM
Babcock, R.E., MacDonald, H., Zachry, D.L., and Jeffus, Hugh, 1981, Northern Arkansas groundwater inventory: Arkansas Water Resources Research Center Miscellaneous Publication 26, 186 p.
Barlow, C.A., and Ogden, A.E., 1982, A statistical comparison of joint, straight cave segment, and photo-lineament orientations: National Speleological Society Bulletin 44, p. 107-110.
Goodman, W.M., and Ogden, A.E., 1980, A preliminary investigation of the ground-water resources of northern Searcy County, Arkansas: Arkansas Academy of Science Proceedings, v. 34, p. 54-57.
Harvey, E.J., 1980, Ground-water in the Springfield-Salem Plateaus of southern Missouri and northern Arkansas: U.S. Geological Survey Water-Resources Investigations Report 80-101, 66 p.
Hedman, E.R., Skelton, John, and Freiwald, D.A., 1987, Flow characteristics for selected streams in the Ozark subregion, Arkansas, Kansas, Missouri, and Oklahoma: U.S. Geological Survey Hydrologic Investigations Atlas HA-688, scale 1:750,000, 4 sheets.
Holland, T.W., 1987, Use of water in Arkansas, 1985: Arkansas Geological Commission Water-Resources Summary 16, 27 p.
_______1993, Use of water in Arkansas, 1990: U.S. Geological Survey Open-File Report 93-48, 1 sheet.
Imes, J.L., 1989, Major geohydrologic units in and adjacent to the Ozark Plateau Province, Missouri, Arkansas, Kansas, and Oklahoma-basement confining unit: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-B, scale 1:750,000, 1 sheet.
_______1990a, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-A, scale 1:750,000, 1 sheet.
_______1990b, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-St. Francois aquifer: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-C, scale 1:750,000, 2 sheets.
_______1990c, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-St. Francois confining layer: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-D, scale 1:750,000, 3 sheets.
_______1990d, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-Ozark aquifer: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-E, scale 1:750,000, 3 sheets.
_______1990e, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-Ozark confining unit: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-F, scale 1:750,000, 3 sheets.
_______1990f, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-Springfield Plateau aquifer: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-G, scale 1:750,000, 3 sheets.
_______1990g, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-Western Interior Plains confining system: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-H, scale 1:750,000, 3 sheets.
Imes, J.L., and Davis, J.V., 1991a, Water type and concentration of dissolved solids, chloride, and sulfate in water from the Springfield Plateau aquifer in Missouri, Arkansas, Kansas, and Oklahoma: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-L, scale 1:750,000, 2 sheets.
_______1991b, Water type and concentration of dissolved solids, chloride, and sulfate in water from the Ozark aquifer in Missouri, Arkansas, Kansas, and Oklahoma: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-K, scale 1:750,000, 4 sheets.
Imes, J.F. and Emmett, L.F., 1994, Geohydrology of the Ozark Plateaus aquifer system in parts of Missouri, Arkansas, Oklahoma, and Kansas: U.S. Geological Survey Professional Paper 1414-D. 127 p.
Lamonds, A.G., 1972, Water-resources reconnaissance of the Ozark Plateaus Province, northern Arkansas: U.S. Geological Survey Hydrologic Investigations Atlas HA-383, scale 1:1,000,000, 2 sheets.
Lattman, L.H., and Parizek, R.R., 1964, Relationship between fracture traces and the occurrence of ground-water
in carbonate rocks: Journal of Hydrology, v. 2, no. 2, p. 73-91.
Leidy, V.A., and Morris, E.E., 1990, Hydrogeology and quality of ground water in the Boone Formation and Cotter Dolomite in karst terrain of northwestern Boone County, Arkansas: U.S. Geological Survey Water-Resources Investigations Report 90-4066, 57 p.
Liebelt, Mike, Gerald, Lundy, and Ogden, A.E., 1980, A preliminary investigation of the ground-water resources of Baxter, Fulton, Izark, and Sharp Counties, Arkansas: Arkansas Academy of Science Proceedings, v. 34, p.72-74.
Ogden, A.E., 1979, Hydrogeologic and geochemical investigation of the Boone-St. Joe Limestone aquifer in Benton County, Arkansas: Arkansas Water Resources Research Center, 133 p.
_______1981, Pseudo karst caves of Arkansas: Proceedings of the Eighth International Congress of Speleology, v. 1-2, p. 766-768.
Ogden, A.E., Chitsazan, M., and Muse, P.S., 1981 [abs.], Factors affecting yield in the Boone-St. Joe Limestone aquifer: Geological Society of America Abstracts with Programs, South-Central Section Meeting, v. 13, no. 5, p. 259.
Ogden, A.E., Goodman, W.M., Rothermel, S.R., 1981, Speleogenesis of Arkansas Ozark Caves: Proceedings of the Eighth International Congress of Speleology, v. 1-2, p. 769-771.
Ogden, A.E., Taylor, N.L., and Thompson, S.D., 1979, A preliminary investigation of rural-use aquifers of Boone, Carroll, and Madison Counties, Arkansas: Arkansas Academy of Science Proceedings, v. 33, p. 58-60.
Vineyard, J.D., and Feder, G.L., 1982, Springs of Missouri: Missouri Department of Natural Resources, Division of Geology and Land Survey, Water Resources Report 29, 212 p.
White, W.B., 1969, Conceptual models for carbonate aquifers: Ground Water, v. 7, no. 3, p. 15-21.
MINOR AQUIFERS
Albin, D.R., 1965, Water Resources of the Ouachita Mountains, Arkansas: U.S. Geological Survey Water-Supply Paper 1809-J, 14 p.
Bedinger, M.S., Sniegocki, R.T., and Poole, J.L., 1970, The thermal springs of Hot Springs National Park, Arkansas-Factors affecting their environment and management: U.S. Geological Survey open-file report, 74 p.
Bedinger, M.S., Pearson, F.J., Jr., Reed, J.R., Sniegocki, R.T., and Stone, C.G., 1979, The waters of Hot Springs National Park, Arkansas-Their nature and origin: U.S. Geological Survey Professional Paper 1044-C, 33 p.
Bryant, C.F., Lyford, F.P., Stafford, K.L., and Johnson, D.M., 1983, Hydrology of area 42, Western Region, Interior Coal Province, Arkansas: U.S. Geological Survey Water-Resources Investigations Open-File Report 82-636, 62 p.
Cole, E.F., and Morris, E.E., 1986, Quality of water resources of the Ouachita National Forest, Arkansas: U.S. Geological Survey Water-Resources Investigations Report 86-4166, scale 1:500,000, 1 sheet.
Cordova, R.M., 1963, Reconnaissance of the ground-water resources of the Arkansas Valley region, Arkansas: U.S. Geological Survey Water-Supply Paper 1669-BB, 33 p.
Goodman, W.M., 1982, A preliminary investigation of ground-water conditions in the Atoka Formation of Pope and Faulkner Counties, Arkansas: Arkansas Academy of Science Proceedings v. 36, p. 31-33.
Halberg, H.N., 1968, Water resources of Grant and Hot Spring Counties, Arkansas: U.S. Geological Survey Water-Supply Paper 1857, 64 p.
Holland, T.W., 1987, Use of water in Arkansas, 1985: Arkansas Geological Commission Water Resources Summary 16, 27 p.
_______1993, Use of water in Arkansas, 1990: U.S. Geological Survey Open-File Report 93-48, 1 sheet.
Imes, J.L, 1990, Major geohydrologic units in and adjacent to the Ozark Plateaus Province, Missouri, Arkansas, Kansas, and Oklahoma-Western Interior Plains confining system: U.S. Geological Survey Hydrologic Investigations Atlas HA-711-H, scale 1:750,000, 3 sheets.
Imes, J.F. and Emmett, L.F., 1994, Geohydrology of the Ozark Plateaus aquifer system in parts of Missouri, Arkansas, Oklahoma, and Kansas: U.S. Geological Survey Professional Paper 1414-D. 127 p.
King, P.B., and Beikman, H.M., 1974, Geologic map of the United States: U.S. Geological Survey, scale 1:2,500,000, 3 sheets.
Rothermel, S.R., Goodman, W.M., Wanslow, J.L., Musgrove, James, Saulsberry, Daryll, and Ogden, A.E., 1982, Reconnaissance of the bedrock aquifers and ground-water chemistry of Crawford, Franklin, and Sebastian Counties, Arkansas: Arkansas Academy of Science Proceedings, v. 36, p. 58-61.
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