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Leahy, P.P., 1992, Consistent data on water quality--It's long overdue: Geotimes December 1992, p 5. 

Leahy, P.P., 1990, Implementation plan for the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 90-174, 10 p.  Available Online

Larson, Steven J., Gilliom, Robert J., and Capel, Paul D., 1999, Pesticides in streams of the United States--Initial results from the National water-quality Assessment Program: U.S. Geological Survey Water-Resources Investigations Report 98-4222, 92 p.  Available Online

Larson, Steven J., Crawford, Charles G., and Gilliom, Robert J., 2004, Development and application of watershed regressions for pesticides (WARP) for estimating atrazine concentration distributions in streams: U.S. Geological Survey Water-Resources Investigations Report 03-4047, 68 p.  Available Online

Larson, Steven J., and Gilliom, Robert J., 2001, Regression models for estimating herbicide concentrations in U.S. streams from watershed characteristics: Journal of the American Water Resources Association, vol. 37, no. 5, p. 1349-1367.  doi: 10.1111/j.1752-1688.2001.tb03644.x Available Online

Larson, S.J., Capel, P.D., and Majewski, M.S., 1997, Pesticides in surface waters--Current understanding of distribution and major influences: U.S. Geological Survey Fact Sheet FS-039-97, 4 p.  Available Online

Larson, S.J., Capel, P.D., and Majewski, M.S, 1997, Pesticides in surface waters: Distribution, trends, and governing factors: Volume 3 of the series: Pesticides in the Hydrologic System: Ann Arbor Press, Chelsea, Michigan, 390 p.  Available Online

Lapham, Wayne W., Neitzert, Kathleen M., Moran, Michael J., and Zogorski, John S., 1997, USGS complies data set for national assessment of VOCs in ground water: Ground Water Monitoring and Remediation, Fall 1997, p. 147-157. 

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

Lapham, W.W., Hamilton, P.A., and Myers, D.N., 2005, National Water-Quality Assessment Program - Cycle II - Regional assessments of aquifers: U.S. Geological Survey Fact Sheet 2005-3013, 4 p.  Available Online

Lapham, W.W., Carter, J.M., Zogorski, J.S., and Valder, J.F., 2006, The occurrence of volatile organic compounds in aquifers of the United States: U.S. Geological Survey Scientific Investigations Map SIM 2931, 1 sheet.  Available Online

Lapham, W.W., and Zogorski, J.S., 1996, Occurrence of MTBE in shallow ground water: U.S. Geological Survey Yearbook 1995 Understanding the Earth, p. 30. 

Landon, Matthew K., Clark, Brian R., McMahon, Peter B., McGuire, Virginia L., and Turco, Michael J., 2008, Hydrogeology, Chemical Characteristics, and Transport Processes in the Zone of Contribution of a Public-Supply Well in York, Nebraska: U.S. Geological Survey Scientific Investigations Report 2008-5050, 149 p.  Available Online

Landon, M.K., Jurgens, B.C., Katz, B.G., Eberts, S.M., Burow, K.R., and Crandall, C.A., 2010, Depth-dependent sampling to identify short-circuit pathways to public-supply wells in multiple aquifer settings in the United States: Hydrogeology Journal, vol. 18, no. 3, p. 577.  doi: 10.1007/s10040-009-0531-2 Available Online

Landon, M.K., Eberts, S.M., Jurgens, B.C., Katz, B.G., Burow, K.R., Crandall, C.A., Brown, C.J., and Starn J.J., 2006, Knowledge of where and how contamination-susceptible water enters public-supply wells can be used to improve monitoring strategies and protection plans: Ground Water Protection Council Annual Forum 2006, Sept.30-Oct.4, 2006, Miami Beach, FL., 15 p.  Available Online

Landon, M.K., and Turco, M.J., 2007, Hydrogeologic Setting and Ground-Water Flow Simulations of the Eastern High Plains Regional Study Area, Nebraska, Section 8 in Paschke, Suzanne S., ed., 2007, Hydrogeologic settings and ground-water flow simulations for regional studies of the transport of anthropogenic and natural contaminants to public-supply wells--studies begun in 2001: U.S. Geological Survey Professional Paper 1737-A, p. 8-1 to 8-26.  Available Online

Kuivila, Kathryn M., Hladik, Michelle L., Ingersoll, Christopher G., Kemble, Nile E., Moran, Patrick W., Calhoun, Daniel L., Nowell, Lisa H., Gilliom, Robert J., 2012, Occurrence and potential sources of pyrethroid insecticides in stream sediments from seven U.S. metropolitan areas: Environmental Science and Technology, vol. 46, no. 8, p. 4297-4303.  doi: 10.1021/es2044882 Available Online

Krutz, L.J., Shaner, D.L., Weaver, M.A., Webb, R.M., Zablotowicz, R.M., Reddy, K.N., Huang, Y., Thomson, S.J., 2010, Agronomic and Environmental Implications of Enhanced s-Triazine Degradation: Pest Management Science, vol. 66, p. 461-481.  doi:10.1002/ps.1909 Available Online

Krabbenhoft, D.P., Wiener, J.G., Brumbaugh, W.G., Olson, M.L., DeWild, J.F., and Sabin, T.J., 1999, A National pilot study of mercury contamination of aquatic ecosystems along multiple gradients: in U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of --Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 147-160.  Available Online

Kolpin, Dana W., Squillace, P.J., Barbash, J.E., and Zogorski, J.S., 1997, Pesticides and volatile organic compounds in shallow urban ground water of the United States: in Chilton, J., ed., Ground water in the urban environment: A.A. balkema, Netherlands, p. 469-474. 

Kolpin, Dana W., Barbash, Jack E., and Gilliom, Robert J., 2000, Pesticides in ground water of the United States, 1992-1996: Ground Water, vol. 38, no. 6, p. 858-863.  Available Online

Kolpin, Dana W., Barbash, Jack E., and Gilliom, Robert J., 1998, Occurrence of pesticides in shallow ground water of the United States: Initial results from the National Water-Quality Assessment Program: Environmental Science & Technology, vol. 32, no. 5, p. 558-566.  doi: 10.1021/es970412g 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, 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

Kolpin, D.W., Barbash, J.E. and Gilliom, R.J., 2002, Atrazine and metolachlor occurrence in shallow groundwater of the United States, 1993-95: Journal of the American Water Resources Association, vol. 38, no.1, p. 301-311.  doi: 10.1111/j.1752-1688.2002.tb01553.x Available Online

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