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Mueller, David K., Ruddy, Barbara C., and Battaglin, William A., 1993, Relation of nitrate concentrations in surface water to land use in the upper-midwestern United States, 1989-1990: in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., compilers, Selected papers on agricultural chemicals in water resources of the midcontinental United States U.S. Geological Survey Open-File Report 93-418, p. 41-50. 

Kalkhoff, S.J., 1994, National Water-Quality Assessment Program--Eastern Iowa Basins: U.S. Geological Survey Fact Sheet 94-031, 2 p.  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

Larson, Steven J., Capel, Paul D., Goolsby, D.A., Zaugg, S.D., and Sandstrom, M.W., 1995, Relations between pesticide use and riverine flux in the Mississippi River Basin: Chemosphere, vol. 31, no. 5, p. 3305-3321.  doi: 10.1016/0045-6535(95)00176-9� 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

Kalkhoff, S.J., and Van Metre, P.C., 1997, Organochlorine compounds in a sediment core from Coralville reservoir, Iowa: U.S. Geological Survey Fact Sheet FS-129-97, 4 p.  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 W., Kalkhoff, Stephen J., Goolsby, Donald A., Sneck-Fahrer, Debra A., and Thurman, E. Michael, 1997, Occurrence of selected herbicides and herbicide degradation products in Iowa's ground water, 1995: Ground Water, vol. 35, no. 4, July-August 1997, p. 679-688.  Available Online

Kolpin, Dana W., Sneck-Fahrer, Debra A., Hallberg, George R., and Libra, Robert D., 1997, Temporal trends of selected agricultural chemicals in Iowa's ground water, 1982-1995: Are things getting better?: Journal of Environmental Quality, vol. 26, no.4, July-August 1997, p. 1007-1017.  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

Mueller, David K., Ruddy, Barbara C., and Battaglin, William A., 1997, Logistic model of nitrate in streams of the upper-midwestern United States: Journal of Environmental Quality, vol. 26, no.5, p. 1223-1230.  Available Online

Roberts, Linda R., 1997, Occurrence of selected organochlorine compounds in fish tissue from Eastern Iowa streams, 1995: U.S. Geological Survey Fact Sheet FS-027-97, 4 p.  Available Online

Savoca, Mark E., Tobias, Jennifer, L., Sadorf, Eric M., and Birkenholtz, Trevor L., 1997, Herbicides and nitrates in the Iowa River alluvial aquifer prior to changing land use, Iowa County, Iowa, 1996: U.S. Geological Survey Fact Sheet FS-085-97, 4 p.  Available Online

Van Metre, P.C., Callender, E., and Fuller, C.C., 1997, Historical trends in organochlorine compounds in river basins identified using sediment cores from reservoirs: Environmental Science and Technology, vol. 31, no. 8, p. 2339-2344.  doi: 10.1021/es960943p 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

Kolpin, D.W., Thurman, E.M., and Linhart, S.M., 1998, The Environmental Occurrence of Herbicides: The Importance of Degradates in Ground Water: Archives of Environmental Contamination and Toxicology, vol. 35, p. 385-390.  doi: 10.1007/s002449900392 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

Van Metre, Peter C., Wilson, Jennifer T., Callender, Edward, and Fuller, Christopher C., 1998, Similar rates of decrease of persistent, hydrophobic and particle-reactive contaminants in riverine systems: Environmental Science & Technology, vol. 32, no. 21 1998, p. 3312-3317.  doi: 10.1021/es9801902 Available Online

Akers, Kimberlee K.B., Schnoebelen, Douglas J., Savoca, Mark E., Roberts, Linda R., and Becher, Kent D., 1999, Water-quality assessment of the Eastern Iowa Basins: Hydrologic and biologic data, September 1995 through September 1996: U.S. Geological Survey Open-File Report 99-66, 154 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

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

Clark, G.M., and Goolsby, D.A., 1999, Occurrence and transport of acetochlor in streams of the Mississippi River Basin: Journal of Environmental Quality, vol. 28, no. 6, p. 1787-1795.  Available Online

Savoca, Mark E., Sadorf, Eric M., and Akers, Kymm K., 1999, Ground-water quality in the eastern part of the Silurian-Devonian and Upper Carbonate aquifers in the Eastern Iowa Basins, Iowa and Minnesota, 1996: U.S. Geological Survey Water-Resources Investigations Report 98-4224, 31 p.  Available Online

Schnoebelen, Douglas J., Becher, Kent D., Bobier, Matthew W., and Wilton, Thomas, 1999, Selected nutrients and pesticides in streams of the Eastern Iowa Basins, 1970-95: U.S. Geological Survey Water-Resources Investigations Report 99-4028, 65 p.  Available Online

Akers, Kimberlee K.B., Montgomery, Denise L., Christiansen, Daniel, Savoca, Mark E., Schnoebelen, Douglas J., Becher, Kent D., and Sadorf, Eric M., 2000, Water-quality assessment of the Eastern Iowa Basins: Hydrologic and biologic data, October 1996 through September 1998: U.S. Geological Survey Open-File Report 00-67, 359 p.  Available Online

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