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Distribution of selected herbicides and nitrate in the Mississippi River and its major tributaries, April through June 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4163, 35 p.

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Data on selected herbicides and two triazine metabolites in precipitation in the midwestern and northeastern United States, 1990-91: U.S. Geological Survey Open-File Report 95-469, 341 p.

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Herbicides in rivers and streams of the Upper Midwestern United States, in The Proceedings of the 46th Annual Meeting of the Upper Mississippi River Conservation Committee, Bettendorf, Iowa, March 13-15, 1990: p. 99-106.

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Pesticides in streams of the Upper Midwestern United States, in Proceedings of the 7th Annual Water and the Future of Kansas Conference, Manhattan, Kansas, March 7-8, 1990: p. 27-28.

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Herbicides in streams--Midwestern United States, in ASE Irrigation and Drainange Engineering Conference, Proceedings, Honolulu, Hawaii, July 22-26, 1991: p. 17-23.

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Occurrence of herbicides and metabolites in surface water, ground water and rainwater, in the midwestern United States--Proceedings of 1995 AWWA Conference, in, Anaheim, CA, June 18-22, 1995: p. 583-591.

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Herbicides and metabolites in surface water, rainwater, and ground water in the midwestern United States--Proceedings of 209th ACS National Meeting, in, Anaheim, California, April 2-7, 1995: p. 278-281.

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Temporal and geographic distribution of herbicides in precipitation in the midwest and northeast United States, 1990-91--Proceedings of the Fourth National Pesticide Conference, in, Richmond, Va., November 1-3, 1993: p. 697-710.

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Metolachlor and alachlor breakdown product formation patterns in aquatic field mesocosms: Environmental Science and Technology, v. 33, no. 24, p. 4471-4476, doi:10.1021/es990686z.

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Use of geographic information systems and scanning technology to create high-resolution historical land-use data sets: U.S. Geological Survey Water-Resources Investigations Report 96-4100, 41 p.

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Preliminary geologic and hydrologic evalution of a small watershed near Plains, Georgia: U.S. Geological Survey Water-Resources Investigations Report 90-4146, 30 p.

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The effect of infiltration and transport mechanisms on nitrate and chloride concentrations beneath a small watershed near Plains, Georgia, in Mallard, G.E., and Ragone, S.E., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Phoenix, Arizona, September 26-30, 1988: U.S. Geological Survey Water-Resources Investigations Report 88-4220, p. 638.

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Determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry: The Science of the Total Environment, v. 248, no. 2-3, p. 147-155, doi:10.1016/S0048-9697(99)00538-0.

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Determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 345-353.

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Hydrogeology and water quality at the Management Systems Evaluation Area near Piketon, Ohio: U.S. Geological Survey Water-Resources Investigations Report 95-4139, 117 p.

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Characterization of hydrology and water quality at the Ohio Management Systems Evaluation Area, in Watermeir, N.L., ed., Proceedings of the Ohio Buried Valley Aquifer Management Systems Evaluation Area Colloquium, Columbus, Ohio, October 27, 1993: Columbus, Ohio, Ohio State University, p. 13-16.

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Water and chemical transport in surface and tile discharge of Walnut Creek, in Dutton, A.R., ed., Toxic Substances and the Hydrologic Sciences--Proceedings of the conference, Austin, Texas, April 10-13, 1994: Minneapolis, Minn., American Institute of Hydrology, p. 430-445.

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Transport and concentrations of selected herbicides and nitrate in the Sangamon River, Illinois, April 1991 - March 1992, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 471-478.

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Assessing aquifer contamination risk using immunoassay--Tracer analysis of atrazine in unsaturated zone sediment: Journal of Environmental Quality, v. 26, p. 1080-1089.

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Degradation of chloroacetanilide herbicides--The prevalence of sulfonic and oxanilic acid metabolites in Iowa ground and surface waters: Environmental Science and Technology, v. 32, no. 11, p. 1738-1740, doi:10.1021/es971138t.

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Herbicides and herbicide degradation products in upper midwest agricultural streams during August base-flow conditions: Journal of Environmental Quality, v. 32, p. 1025-1035.

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Isotopic tracing of nitrogen sources and cycling in the Mississippi River Basin, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 339-343.

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Water solubility enhancements of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration: Environmental Science and Technology, v. 23, no. 7, p. 832-838, doi:10.1021/es00065a012.

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Relation of land use to ground-water quality in the outcrop of the Potomac-Raritan-Magothy aquifer system in New Jersey, in National water summary 1986--Hydrologic events and ground-water quality: U.S. Geological Survey Water-Supply Paper 2325, p. 109-114.

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Methods of analysis by the U.S. Geological Survey Organic Geochemistry 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.

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Enantiomeric separation of metolachlor and its metabolites using LC-MS and CZE: Chemosphere, v. 62, no. 10, p. 1591-1599, doi:10.1016/j.chemosphere.2005.06.048.

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Importance of the Mississippi River Basin for investigating agricultural--chemical contamination of the hydrologic cycle: The Science of the Total Environment, v. 248, no. 2-3, p. 71-72, doi:10.1016/S0048-9697(99)00530-6.

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Agricultural chemicals in groundwater of the midwestern United States--Relations to land use: Journal of Environmental Quality, v. 26, no. 4, p. 1025-1037.

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Agricultural chemicals in ground water of the Midwest--Proceedings of the 12th Annual Water and the Future of Kansas Conference, in, Manhattan, Kansas, February 28-March 1, 1995: p. 19-21.

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Pesticide degradates--Monitoring and occurrence, in Proceedings of International Symposium on Pesticides, their Degradates, and Adjuvants, Prague, Czech Republic, June 4, 2004.

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Work plan for regional reconnaissance for selected herbicides and nitrate in ground water of the Midcontinent United States, 1991: U.S. Geological Survey Open-File Report 91-59, 18 p.

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Nitrate in groundwater of the Midwestern United States--A regional investigation on relations to land use and soil properties: International Association of Hydrological Sciences (IAHS) Publication no. 257, p. 111-116.

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Herbicides and nitrate in near-surface aquifers of the Mid-Continent United States: U.S. Geological Survey Water-Supply Paper 2413, 34 p.

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Hydrogeologic, water-quality and land-use data for the reconnaissance of herbicides and nitrate in near-surface aquifers of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-114, 61 p.

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Water-quantity and water-quality aspects of a 500-year flood--Nishnabotna River, southwest Iowa, June 1998: U.S. Geological Survey Water-Resources Investigations Report 00-4025, 6 p.

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A regional monitoring network to investigate the occurrence and distribution of agricultural chemicals in near-surface aquifers of the midcontinental United States, in Proceedings of Conference on Groundwater Quality--Remediation and Protection: International Association of Hydrological Sciences Publication No. 225, p. 13-20.

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Pesticides in near-surface aquifers--Results of the Midcontinental United States ground-water reconnaissance, 1991-92, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, v. 1, p. 505-513.

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Pesticides in near-surface aquifers--Results of the Midcontinental United States ground-water reconnaissance, 1991-92, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., eds., Selected papers on agricultural chemicals in water resources of the Midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 64-74.

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Pesticides in near-surface aquifers--An assessment using highly sensitive analytical methods and tritium: Journal of Environmental Quality, v. 24, no. 6, p. 1125-1132.

Kolpin, D.W., Hallberg, G., Sneck-Fahrer, D.A., and Libra, R., 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.

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Atrazine degradation in a small stream in Iowa: Environmental Science and Technology, v. 27, no. 1, p. 134-139, doi:10.1021/es00038a014.

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Occurrence of selected herbicides and herbicide degradation products in Iowa's ground water, 1995: Ground Water, v. 35, no. 4, p. 679-688.

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Acetochlor in the hydrologic system in the midwestern United States, 1994: Environmental Science and Technology, v. 30, no. 5, p. 1459-1464, doi:10.1021/es9503241.

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Degradates provide insight to spatial and temporal trends of herbicides in ground water: Ground Water, v. 42, no. 4, p. 601-608.

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Temporal trends of selected agricultural chemicals in Iowa's groundwater, 1982-1995--Are things getting better?: Journal of Environmental Quality, v. 26, no. 4, p. 1007-1017.

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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.

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Post-flood occurrence of selected agricultural chemicals and volatile organic compounds in near-surface unconsolidated aquifers in the Mississippi River Basin, 1993: U.S. Geological Survey Circular 1120G, 20 p.

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Occurrence of selected pesticides and their metabolites in near-surface aquifers of the midwestern United States: Environmental Science and Technology, v. 30, no. 1, p. 335-340, doi:10.1021/es950341q.

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Urban contributions of glyphosate and its degradate AMPA to streams in the United States: Science of the Total Environment, v. 354, no. 2-3, p. 191-197, doi:10.1016/j.scitotenv.2005.01.028.

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Occurrence of cyanazine compounds in groundwater--Degradates more prevalent than the parent compound: Environmental Science and Technology, v. 35, no. 6, p. 1217-1222, doi:10.1021/es001520x.

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