Cuffney, T.F., Gurtz, M.E., and Meador, M.R., 1993, Methods for collecting benthic invertebrate samples as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 93-406, 66 p.

Fishman, M.J., and Friedman, L.C., eds., 1989, Methods for the determination of inorganic substances in water and fluvial sediments: U.S. Geological Survey Techniques of Water-Resources Investigations, book 5, chap. A1, 545 p.

Fitzpatrick, F.A., Waite, I.R., D'Arconte P.J., Meador, M.R., Maupin, M.A. and Gurtz, M.E., 1998, Revised methods for characterizing stream habitat in the National Water-Quality Assessment Program: U.S. Geological Survey Water-Resources Investigations Report 93-4052, 67 p.

Healy, R.W., 1979a, River mileages and drainage areas for Illinois streams-Volume 1, Illinois except Illinois River Basin: U.S. Geological Survey Water-Resources Investigations Report 79-110, 350 p.

---1979b, River mileages and drainage areas for Illinois streams-Volume 2, Illinois River Basin: U.S. Geological Survey Water-Resources Investigations Report 79-111, 302 p.

Horowitz, A.J., Demas, C.R., Fitzgerald, K.K., Miller, T.L., and Rickert, D.A., 1994, U.S. Geological Survey protocol for the collection and processing of surface-water samples for the subsequent determination of inorganic constituents in filtered water: U.S. Geological Survey Open-File Report 94-539, 57 p.

Johnson, G.D., 1984, Percodei: development and relationships, in American Society of Ichthyologists and Herpetologists, Ontogeny and Systematics of Fish, based on an international symposium dedicated to the memory of Elbert Halvor Ahlstrom: [New York], American Society of Ichthyologists and Herpetologists, Special Publication no. 1, p. 464-498.

Kish, J.L., Thurman, E.M., Scribner, E.A., and Zimmerman, L.R., 2000, Methods of analysis by the U.S. Geological Survey Organic Research Group-determination of selected herbicides and their degradation products in water using solid-phase extraction and gas chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 00-385, 13 p.

Kolpin, D.W., 1998, Herbicides in ground water of the Midwest: a regional study of shallow aquifers, 1991-94: U.S. Geological Survey Fact Sheet FS-076-98, 4 p.

Kolpin, D.W., and Burkhart, M.R., 1991, Workplan for regional reconnaissance for selected herbicides and nitrate in ground water of the mid-continent United States, 1991: U.S. Geological Survey Open-File Report 91-59, 18 p.

Kolpin, D.W., Burkhart, M.R., and Thurman, E.M., 1993, Hydrogeologic, water-quality, and land-use data for the reconnaissance of herbicides and nitrate in near-surface aquifers of the midcontinental United States, 1991:  U.S. Geological Survey Open-File Report 93-114, 61 p.

Kolpin, D.W., Burkhart, M.R., and Thurman, E.M., 1994, Herbicides and nitrate in near-surface aquifers in the midwestern United States, 1991: U.S. Geological Survey Water-Supply Paper 2413, 34 p.

Kolpin, D.W., and Thurman, E.M., 1993, Postflood occurrence of selected agricultural chemicals and volatile organic compounds in near surface unconsolidated aquifers in the upper Mississippi River Basin, 1993: U.S. Geological Survey Circular 1120-G, 20 p.

Kolpin, D.W., Zichelle, K.E., and Thurman, E.M., 1996, Water-quality data for nitrates, pesticides, and volatile organic compounds in near-surface aquifers of the midcontinental United States, 1992-1994: U.S. Geological Survey Open-File Report 96-435, 47 p.

Koterba, M.T., Wilde, F.D., and Lapham, W.W., 1995, Ground-water data-collection protocols and procedures for the National Water-Quality Assessment Program--collection and documentation of water-quality samples and related data: U.S. Geological Survey Open-File Report 95-399, 113 p.

Lee, E.A., Kish, J.L., Zimmerman, L.R., and Thurman, E.M., 2001, Method of analysis by the U.S. Geological Survey Organic Geochemistry Research Group - update and additions to the determination of chloroacetanilide herbicide degradation compounds in water using high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 01-10, 17 p.

Lee, E.A., Strahan, A.P., and Thurman, E.M., 2002, Methods of Analysis by the U.S. Geological Survey Organic Geochemistry Research Group - determination of glyphosate, aminomethylphosphonic acid, and glufosinate in water using online solid-phase extraction and high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 01-454, 13 p.

Lepkin, W.D., M.M. DeLapp, W.H. Kirby, and T.A. Wilson, 1981, WATSTORE user's guide--Volume 4, Chapter I: U.S. Geological Survey Open-File Report 79-1336-I.

Meador, M.R., Hupp, C.R., Cuffney, T.F. and Gurtz, M.E., 1993, Methods for characterizing stream habitat as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 93-408, 48 p.

Midwestern Regional Climate Center, Midwestern Climate Information System (MICIS) data available on the Web, accessed March 12, 2004, at http://mrcc.sws.uiuc.edu/Watch/watch.htm.

Mills, P.C., Yeskis, D.J., Straub, T.D., 1998, Geologic, hydrologic, and water-quality data from selected boreholes and wells in and near Belvidere, Ill., 1993-96: U.S. Geological Survey Open-File Report 97-242, 151 p.

Mills, P.C., Thomas, C.A., Brown, T.A., Yeskis, D.J., and Kay, R.T., 1999, Potentiometric levels and water quality in the aquifers underlying Belvidere, Ill., 1993-96: U.S. Geological Survey Water-Resources Investigations Report 98-4220, 106 p.

Mills, P.C., Nazimek, J.E., Halford, K.J., Yeskis, D.J., 2002, Hydrogeology and simulation of ground-water flow in the aquifers underlying Belvidere, Illinois: U.S. Geological Survey Water-Resources Investigations Report 01-4100, 103 p.

Mills, P.C., and McMillan, W.D., 2004, Herbicides and their transformation products in source-water aquifers tapped by public-supply wells in Illinois: U.S. Geological Survey Water-Resources Investigations Report 03-4226, 57 p.

Moulton, S.R., II, Carter, J.L., Grotheer, S.A., Cuffney, T.F., and Short, T.M., 2000, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory -- Processing, taxonomy, and quality control of benthic macroinvertebrate samples: U.S. Geological Survey Open-File Report 00-212, 49 p.

Moulton, S.R., II, Kennen, J.G., Goldstein, R.M., and Hambrook, J.A., 2002, Revised protocols for sampling algal, invertebrate, and fish communities as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 00-150, 75 p.

Novak, C.E., 1985, WRD Data Report Preparation Guide: U.S. Geological Survey, 199 p.

Parenti, L.R., 1981, A phylogenetic and biogeographic analysis of cyprinodontiform fishes (Teleostei, Atherinomorpha): Bulletin of the American Museum of Natural History, v. 168, p. 335-557.

Porter, S.D., Cuffney, T.F., Gurtz, M.E., and Meador, M.R., 1993, Method for collecting algal samples as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 93-409, 39 p.

Rantz, S.E., and others, 1982, Measurement and computation of streamflow: Volumes 1 and 2: U.S. Geological Survey Water-Supply Paper 2175, 631 p.

Robins, C.R., Bailey, R.M., Bond, C.E., Brooker, J.R., Lachner, E.A., Lea, R.N., and Scott, W.B., 1991, Common and scientific names of fishes from the United States and Canada (5th ed.): Bethesda, Md., American Fisheries Society, Special Publication no. 20, 183 p.

Scott, J.C., 1990, Computerized stratified random site-selection approaches for design of a ground-water-quality sampling network: U.S. Geological Survey Water-Resources Investigations Report 90-4101, 109 p.

Shelton, L.R., and Capel, P.D., 1994, Guidelines for collecting and processing samples of stream bed sediment for analysis of trace elements and organic contaminants for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 94-458, 20 p.

Shelton, L.R., 1994, Field guide for collecting and processing stream-water samples for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 94-455, 42 p.

U.S. Department of Commerce, National Oceanic and Atmospheric Administration, 1972, Technical memorandum NWS HYDRO-14: National Weather Service river forecast system forecast procedures, Washington, D.C., 251 p.

Zimmerman, L.R., Hostetler, K.A., and Thurman, E.M., 2000, Method of analysis by the U.S. Geological Survey Organic Geochemistry Research Group - Determination of chloroacetanilide herbicides in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 00-182, 30 p.

Zimmerman, L.R., and Thurman, E.M., 1999, Method of analysis by the U.S. Geological Survey Organic Geochemistry Research Group - determination of triazine and chloroacetanilide herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected ion monitoring: U.S. Geological Survey Open-File Report 98-634, 21 p.