References Cited


Alexander, R.B., Smith, R.A., Schwarz, G.E., Boyer, E.W., Nolan, J.V., and Brakebill, J.W., 2008, Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin: Environmental Science and Technology, v. 42, no. 3, p. 822–830.


Brakebill, J.W., Wolock, D.M., and Terziotti, S.E., 2011, Digital hydrologic networks supporting applications related to spatially referenced regression modeling: Journal of the American Water Resources Association, v. 47, no. 5, p. 1752–1688.


Brown, J.B., Sprague, L.A., and Dupree, J.A., 2011, Nutrient sources and transport in the Missouri River Basin, with emphasis on the effects of irrigation and reservoirs: Journal of the American Water Resources Association, v. 47, no. 5, p. 1034–1060.


Compton, J.E., Dennis, R.L, Walker, H.A., Milstead, W.B., Jordan , S.J., Hill, B.H., Fritz, K.M., Devereux, Richard, Johnson, B.R., Beaulieu, J.J., Latimer, J.S., Lynch, J.A., Waite R.G., and Davis C.C., 2009, Linking ecosystem services and nitrogen—Science to improve management of nitrogen in air, land and water: Corvallis, Oreg., U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory–Western Ecology Division, 82 p.


Elliot, W.J., 2006, The roles of natural and human disturbances in forest soil erosion, in Owens, P.N., and Collins, A.J., eds., Soil erosion and sediment redistribution in river catchments: Oxfordshire, United Kingdom, Centre for Agricultural Bioscience International, 328 p.


Garcia, A.M., Hoos, A.B., and Terziotti, Sylvia, 2011, A regional modeling framework of phosphorus sources and transport in streams of the southeastern United States: Journal of the American Water Resources Association, v. 47, no. 5, p. 991–1010.


Hochberg, Yossi, 1988, A sharper Bonferroni procedure for multiple tests of significance: Biometrika, v. 75, p. 800–802.


Homer, Collin, Huang, Chengquan, Yang, Limin, Wylie, Bruce, and Coan, Michael, 2004, Development of a 2001 national land cover database for the United States: Photogrammetric Engineering and Remote Sensing, v. 70, p. 829–840.


Hoos, A.B., and McMahon, Gerard, 2009, Spatial analysis of instream nitrogen loads and factors controlling nitrogen delivery to streams in the southeastern United States using Spatially Referenced Regressions on Watershed Attributes (SPARROW) and regional classification frameworks: Hydrological Processes, v. 22, no. 16, p. 2275–2294.


Horizon Systems, 2013, NHDPlusV2Data: Horizon Systems database, accessed March 18, 2013, at http://www.horizon-systems.com/nhdplus/.


Mansfield, G.R., and Boardman, Leona, 1932, Nitrate deposits of the United States: U.S. Geological Survey Bulletin 838, 107 p.


Moore, R.B., Johnston, C.M., Smith, R.A., and Milstead, Bryan, 2011, Source and delivery of nutrients to receiving waters in the northeastern and mid-Atlantic regions of the United States: Journal of the American Water Resources Association, v. 47, no. 5, p. 965–990.


National Research Council, 2001, Assessing the TMDL Approach to Water Quality Management: Washington D.C., National Academy Press, 109 p.


Preston, S.D., Alexander, R.B., Woodside, M.D., and Hamilton, P.A., 2009, SPARROW modeling—Enhancing understanding of the Nation’s water quality: U.S. Geological Survey Fact Sheet 2009-3019, 6 p.


Rebich, R.A., Houston, N.A., Mize, S.V., Pearson, D.K., Ging, P.B., and Hornig, C.E., 2011, Sources and delivery of nutrients to the northwestern Gulf of Mexico from streams in the south-central United States: Journal of the American Water Resources Association, v. 47, no. 5, p. 1061–1086.


Robertson, D.M., and Saad, D.A., 2011, Nutrient inputs to the Laurentian Great Lakes by source and watershed estimated using SPARROW watershed models: Journal of the American Water Resources Association, v. 47, no. 5, p. 1011–1033.


Saad, D.A., Schwarz, G.E., Robertson, D.M., and Booth, N.L., 2011, A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models: Journal of the American Water Resources Association, v. 47, no. 5, p. 933–949.


Schwarz, G.E., Hoos, A.B., Alexander, R.B., and Smith, R.A., 2006, The SPARROW surface water-quality model—Theory, applications and user documentation: U.S. Geological Survey Techniques and Methods, book 6, chap. B3, 248 p. and CD-ROM.


Seaber, P.R., Kapinos, F.P., and Knapp, G.L., 1987, Hydrologic unit maps: U.S. Geological Survey Water-Supply Paper 2294, 63 p.


Simes, R.J., 1988, An improved Bonferroni procedure for multiple tests of significance: Biometrika, v. 73, p. 750–754.


Simley, J.D., and Carswell, W.J. Jr., 2009, The National Map—Hydrography: U.S. Geological Survey Fact Sheet 2009-3054, 4 p. (Also available at http://pubs.usgs.gov/fs/2009/3054/.)


Smith, R.A., Schwarz, G.E., and Alexander, A.B., 1997, Regional interpretation of water-quality monitoring data, Water Resources Research, v. 33, no. 12, p. 2781–2798.


U.S. Geological Survey, 2002, Western phosphate field, U.S.A.—Science in support of land management: U.S. Geological Survey Fact Sheet 100-02, 2 p. (Also available at http://pubs.usgs.gov/fs/fs-100-02/.)


U.S. Geological Survey, 2012, National Water Information System (NWISWeb): U.S. Geological Survey database, accessed October 6, 2012, at http://waterdata.usgs.gov/nwis. 


Wieczorek, M.E., and Lamotte, A.E., 2013, Attributes for MRB_E2RF1 catchments by major river basins in the conterminous United States: U.S. Geological Survey Digital Data Series DS–491, accessed March 18, 2013, at http://water.usgs.gov/nawqa/modeling/rf1attributes.html.


Wise, D.R., and Johnson, H.M., 2011, Surface-water nutrient conditions and sources in the United States Pacific Northwest: Journal of the American Water Resources Association, v. 47, no. 5, p. 1110–1135.


First posted July 17, 2013