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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

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

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, 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

Liao, Lixia, Green, Christopher T., Bekins, Barbara A., and Böhlke, J.K., 2012, Factors controlling nitrate fluxes in groundwater in agricultural areas: Water Resources Research, vol. 48, W00L09, 18 p.  doi: 10.1029/2011WR011008, Available Online

Lico, Michael S., and Pennington, R. Nyle, 1997, Concentrations, loads, and yields of potentially toxic constituents in irrigation-drain systems, Newlands Project area, Carson Desert, Nevada, Nov. 1994 - Oct. 1995: U.S. Geological Survey Water-Resources Investigations Report 97-4034, 58 p.  Available Online

Linard, J.I., Wolock, D.M., Webb, R.M.T., and Wieczorek, M.E., 2009, Identifying hydrologic processes in agricultural watersheds using precipitation-runoff models: U.S. Geological Survey Scientific Investigations Report 2009-5126, 22 p.  Available Online

Lindgren, R.J., Houston, N.A., Musgrove, M., Fahlquist, L.S., and Kauffman, L.J., 2011, Simulations of groundwater flow and particle-tracking analysis in the zone of contribution to a public-supply well in San Antonio, Texas: U.S. Geological Survey Scientific Investigations Report 2011-5149, 93 p.  Available Online

Lindgren, Richard J., Houston, Natalie A., Musgrove, MaryLynn, Fahlquist, Laura S., and Kauffman, Leon J., 2011, Hydrogeologic setting and groundwater-flow simulations of the South-Central Texas regional study area, Texas, Section 3 in Eberts, Sandra M., ed., Hydrogeologic settings and groundwater-flow simulations for regional investigations of the transport of anthropogenic and natural contaminants to public-supply wells--Investigations begun in 2004: U.S. Geological Survey Professional Paper 1737-B, Section 3, p. 3-1 to 3-51.  Available Online

Litke, David W., 1996, Sources and loads of nutrients in the South Platte River, Colorado and Nebraska, 1994-95: U.S. Geological Survey Water-Resources Investigations Report 96-4029, 31 p.  Available Online

Lizarraga, Joy S., 1997, Estimation and analysis of nutrient and suspended- sediment loads at selected sites in the Potomac River Basin, 1993-95: U.S. Geological Survey Water-Resources Investigations Report 97-4154, 23 p.  Available Online

Lyford, F.P., Carlson, Carl S., Brown, Craig J., and Starn, J. Jeffrey, 2007, Hydrogeologic setting and ground-water flow simulations of the Pomperaug River Basin Regional Study Area, Connecticut, Section 6 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. 6-1 to 6-24.  Available Online

Mahler, B.J., Van Metre, P.C., Wilson, J.T., Guilfoyle, A.L., and Sunvison, M.W., 2006, Concentrations, loads, and yields of particle-associated contaminants in urban creeks, Austin, Texas, 1999-2004: U.S. Geological Survey Scientific Investigations Report 2006-5262, 107 p.  Available Online

Martin, J.D., and Eberle, Michael, 2011, Adjustment of pesticide concentrations for temporal changes in analytical recovery, 1992-2010: U.S. Geological Survey Data Series 630, 11 p.  Available Online

McCabe, G.J., Wolock, D.M., 2011, Independent effects of temperature and precipitation on modeled runoff in the conterminous United States: Water Resources Research, 47, W11522.  doi:10.1029/2011WR010630 Available Online

McMahon, G., 2007, Consequences of land-cover misclassification in models of impervious surface: Photogrammetric Engineering & Remote Sensing, vol. 73, no. 12, p. 1343-1353.  Available Online

McMahon, Gerald and Roessler, Chris, 2002, A regression-based approach to understand baseline total nitrogen loading for TMDL planning: Proceedings of Water Environment Federation National TMDL Science and Policy 2002 Specialty Conference, Phoenix, Arizona, November 13-16,2002, 27 p. 

McMahon, Gerald, Alexander, R.B., and Qian, S., 2003, Support of Total Maximum Daily Load programs using spatially referenced regression models: ASCE Journal of Water Resources Planning and Management, vol. 129, no. 4, p. 315-329.  doi: 10.1061/(ASCE)0733-9496(2003)129:4(315) Available Online

McMahon, P.B., 2001, Vertical gradients in water chemistry in the Central High Plains Aquifer, southwestern Kansas and Oklahoma Panhandle, 1999: U.S. Geological Survey Water-Resources Investigations Report 01-4028, 47 p.  Available Online

McMahon, P.B., and Böhlke, J.K., 2006, Regional patterns in the isotopic composition of natural and anthropogenic nitrate in ground water, High Plains, USA: Environmental Science & Technology, vol. 40, p. 2965-2970.  doi: 10.1021/es052229q Available Online

McMahon, P.B., Böhlke, J.K., and Carney, C.P., 2007, Vertical gradients in water chemistry and age in the northern High Plains aquifer, Nebraska, 2003: U.S. Geological Survey Scientific Investigations Report 2006-5294, 58 p.  Available Online

McMahon, P.B., Böhlke, J.K., and Lehman, T.M., 2004, Vertical gradients in water chemistry and age in the southern High Plains aquifer, Texas, 2002: U.S. Geological Survey Scientific Investigations Report 2004-5053, 53 p.  Available Online

McMahon, P.B., Böhlke, J.K., Kauffman, L.J., Kipp, K.L., Landon, M.K., Crandall, C.A., Burow, K.R., and Brown, C.J., 2008, Source and transport controls on the movement of nitrate to public supply wells in selected principal aquifers of the United States: Water Resources Research, vol. 44, W04401, 17 p.  doi: 10.1029/2007WR006252 Available Online

McMahon, P.B., Burow K.R., Kauffman, L.J.,Eberts, S.M., Böhlke, J.K., and Gurdak, J.J., 2008, Simulated response of water quality in public supply wells to land use change: Water Resources Research, vol. 44, W00A06, 16 p.  doi: 10.1029/2007WR006731 Available Online

McMahon, P.B., Dennehy, K.F., Bruce, B.W., Böhlke, J.K., Michel, R.L., Gurdak, J.J., and Hurlbut, D.B., 2006, Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, United States: Water Resources Research, vol. 42, W03413, 18 p.  doi: 10.1029/2005WR004417 Available Online

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