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Carlisle, D.M., and Meador, M.R., 2007, A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages: Journal of the American Water Resources Association, vol. 43, p. 1194-1207.  doi: 10.1111/j.1752-1688.2007.00097.x Available Online

Kolpin, D.W., Nations, B.K., Goolsby, D.A., and Thurman, E.M., 1996, Acetochlor in the hydrologic system in the midwestern United States, 1994: Environmental Science & Technology, vol. 30, no. 5, p. 1459-1464.  doi: 10.1021/es9503241 Available Online

Burkart, M.R., Kolpin, D.W., Jaquis, R.J., and Cole, K.J., 1999, Agrichemicals in ground water of the midwestern USA: Journal of Environmental Quality, vol. 28, no. 6, p. 1908-1915.  Available Online

Kolpin, Dana W., 1997, Agricultural chemicals in ground water of the midwestern United States: Relations to land use: Journal of Environmental Quality, vol. 26, no. 4, July-August 1997, p. 1025-1037.  Available Online

Kolpin, Dana, Hallberg, George, Sneck-Fahrer, Debra, and Libra, Robert, 1997, Agricultural chemicals in Iowa's ground water, 1982-95--What are the trends?: U.S. Geological Survey Fact Sheet FS-116-97, 4 p.  Available Online

Majewski, Michael S., Foreman, William T., Goolsby, Donald A., and Nakagaki, Naomi, 1998, Airborne pesticide residues along the Mississippi River: Environmental Science & Technology, vol. 32, no. 23, p. 3689-3698.  doi: 10.1021/es9802403 Available Online

Capel, P.D., Ma, Lin, Schroyer, B.R., Larson, S.J., and Gilchrist, T.A., 1995, Analysis and detection of the new corn herbicide acetochlor in river water and rain: Environmental Science and Technology, vol. 29, no. 6, p. 1702-1705.  doi: 10.1021/es00006a039 Available Online

Baker, N.T., and Stone,W.W., 2014, Annual agricultural pesticide use for midwest stream-quality assessment, 2012-13: U.S. Geological Survey Data Series 863, pamphlet, 4 tables, 17 p.  Available Online

Brown, Juliane B., 2011, Application of the SPARROW watershed model to describe nutrient sources and transport in the Missouri River Basin: U.S. Geological Survey Fact Sheet 2011-3104, 4 p.  Available Online

Burkart, M.R., Kolpin, D.W., and James, D.E., 1999, Assessing groundwater vulnerability to agrichemical contamination in the Midwest US: Water Science & Technology, vol. 39, no. 3, p. 103-112.  Available Online

Frey, J.W., Bell, A.H., Hambrook Berkman, J.A., and Lorenz, D.L., 2011, Assessment of nutrient enrichment by use of algal-, invertebrate-, and fish-community attributes in wadeable streams in ecoregions surrounding the Great Lakes: U.S. Geological Survey Scientific Investigations Report 2011-5009, 49 p.  Available Online

Brigham, Allison R., and Sadorf, Eric M., 2001, Benthic invertebrate assemblages and their relation to physical and chemical characteristics of streams in Eastern Iowa streams, 1996-98: U.S. Geological Survey Water-Resources Investigations Report 00-4256, 44 p.  Available Online

Mullaney, J.R., Lorenz, D.L., Arntson, A.D., 2009, Chloride in groundwater and surface water in areas underlain by the glacial aquifer system, northern United States: U.S. Geological Survey Scientific Investigations Report 2009-5086, 41 p.  Available Online

Essaid, H.I., McCarthy, K.A., and Baker, N.T., 2016, Contrasting Nitrogen Fate in Watersheds Using Agricultural and Water Quality Information: Journal of Environmental Quality,   doi: 10.2134/jeq2016.02.0071 Available Online

Green, C.T., Bekins, B.A., Kalkhoff, S.J., Hirsch, R.M., Liao, L., and Barnes, K.K., 2014, Decadal surface water quality trends under variable climate, land use, and hydrogeochemical setting in Iowa, USA: Water Resour. Res., 50,   doi:10.1002/2013WR014829 Available Online

Kalkhoff, S.J., Kolpin, Dana W., Thurman, E.M., Ferrer, I., and Barcelo, D., 1998, Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters: Environmental Science & Technology, vol. 32, no. 11, p. 1738-1740.  doi: 10.1021/es971138t Available Online

Alexander, R.B., Smith, R.A., Schwarz, G.S., 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, vol. 42, no. 3, p. 822-830.  doi: 10.1021/es0716103 Available Online

Lutz, M.A., and Kennedy, J.L., Jr., 2010, Digital orthophotograph-based riparian land cover for 86 stream segments in the eight study units in Major River Watershed 3 of the National Water-Quality Assessment Program: U.S. Geological Survey Data Series 536, on-line only.  Available Online

McCarthy, K.A., Lampe, D.C., and Capel, P.D., 2011, Discrete and continuous water-quality data and hydrologic parameters from seven agricultural watersheds in the United States, 2002-09: U.S. Geological Survey Data Series 603, 10 p.  Available Online

Capel, Paul D., and Larson, Steven J., 2001, Effect of scale on the behavior of atrazine in surface waters: Environmental Science & Technology, vol. 35, no. 4, p. 648-657.  doi: 10.1021/es001123m Available Online

Alexander, Richard B., Smith, Richard A., and Schwarz, Gregory E., 2000, Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico: Nature, vol. 403, February 17, 2000, p. 758-761.  Available Online

Meador, Michael R., and McIntyre, Julie P., 2003, Effects of electrofishing gear type on spatial and temporal variability in fish community sampling: Transactions of the American Fisheries Society, vol. 132, p. 709-716.  doi: 10.1577/T01-135 Available Online

Savoca, Mark E., Sadorf, Eric M., Linhart, S. Mike, and Akers, Kymm K.B., 2000, Effects of land use and hydrogeology on the water quality of alluvial aquifers in eastern Iowa and southern Minnesota, 1997: U.S. Geological Survey Water-Resources Investigations Report 99-4246, 38 p.  Available Online

Kalkhoff, Stephen J., Vecchia, Aldo V., Capel, Paul D., and Meyer, Michael T., 2012, Eleven-year trend in acetanilide pesticide degradates in the Iowa River, Iowa: Journal of Environmental Quality, vol. 41, no. 5, p. 1566-1579.  doi: 10.2134/jeq2011.0426 Available Online

Lapham, Wayne W., Moran, Michael J., and Zogorski, John S., 2000, Enhancements of nonpoint source monitoring of volatile organic compounds in ground water: Journal of the American Water Resources Association, vol. 36, no. 6, December 2000, p. 1321-1334.  doi: 10.1111/j.1752-1688.2000.tb05729.x Available Online

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