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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

Heywood, C.E., 2013, Simulations of groundwater flow, transport, and age in Albuquerque, New Mexico, for a study of transport of anthropogenic and natural contaminants (TANC) to public-supply wells: U.S. Geological Survey Scientific Investigations Report 2012-5242, 51 p.  Available Online

Scott, J.C., Skach, K.A., and Toccalino, P.L., 2013, Software for analysis of chemical mixtures-composition, occurrence, distribution, and possible toxicity: U.S. Geological Survey Scientific Investigations Report 2013-5030, 27 p.  Available Online

Moore, R.B., Johnston, C.M., Smith, R.A., and Milstead, B., 2011, Source and delivery of nutrients to receiving waters in the Northeastern and Mid-Atlantic regions of the United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p.  doi: 10.1111/j.1752-1688.2011.00582.x 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

Pankow, J.F., Asher, W.E., and Zogorski, J.S., 2006, Source apportionment modeling of volatile organic compounds in streams: Environmental Toxicology and Chemistry, vol. 25, no. 4, p. 921-932.  Available Online

Rebich, R.A., Houston, N.A., Mize, S.V., Pearson, D.K., Ging, P.B., and Hornig, C.E., 2011, Sources and delivery of nutrients to the northwestern Gulf of Mexico from streams in the South-Central United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p.  doi: 10.1111/j.1752-1688.2011.00583.x 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

Ator, S.W., Brakebill, J.W., and Blomquist, J.D., 2011, Sources, fate, and transport of nitrogen and phosphorus in the Chesapeake Bay Watershed - An empirical model: U.S. Geological Survey Scientific Investigations Report 2011-5167, 27 p.  Available Online

Hoos, Anne B., Robinson, John A., Aycock, Robert A., Knight, Rodney, R., and Woodside, Michael D., 2000, Sources, instream transport, and trends of nitrogen, phosphorus, and sediment in the Lower Tennessee River Basin, 1980-96: U.S. Geological Survey Water-Resources Investigations Report 99-4139, 96 p.  Available Online

Anning, D.W., Thiros, S.A., Bexfield, L.M., McKinney, T.S., and Green, J.M., 2009, Southwest principal aquifers regional ground-water quality assessment: U.S. Geological Survey Fact Sheet 2009-3015, 4 p.  Available Online

Preston, Stephen D., Alexander, Richard B., Woodside, Michael D., and Hamilton, Pixie A., 2009, SPARROW modeling - Enhancing understanding of the Nation's water quality: U.S. Geological Survey Fact Sheet 2009-3019, 6 p.  Available Online

Preston, S.D., Alexander, R.B., and Wolock, D.M., 2011, SPARROW modeling to understand water-quality conditions in major regions of the United States: A featured collection introduction: Journal of the American Water Resources Association, online 22Aug2011, 4 p.  doi: 10.1111/j.1752-1688.2011.00585.x Available Online

Robertson, D.M., and Saad, D.A., 2013, SPARROW Models Used to Understand Nutrient Sources in the Mississippi/Atchafalaya River Basin: Journal of Environmental Quality, vol. 42, no. 5, p. 1422-1440.  doi: 10.2134/jeq2013.02.0066 Available Online

Hoos, A.B., and McMahon, Gerard, 2009, Spatial analysis of instream nitrogen loads and factors controlling nitrogen delivery to streams in the southeastern United States using spatially referenced regression on watershed attributes (SPARROW) and regional classification frameworks: Hydrological Processes, vol. 23, no. 16, p. 2275-2294.  doi: 10.1002/hyp.7323 Available Online

Nolan, Bernard T., Baehr, Arthur L., and Kauffman, Leon J., 2003, Spatial variability of groundwater recharge and its effect on shallow groundwater quality in southern New Jersey: Vadose Zone Journal, vol. 2, p. 677-691.  Available Online

Preston, S.D., Alexander, R.B., Schwarz, G.E., and Smith, R.A., 2014, Spatially Explicit Modeling to Evaluate Regional Stream Water Quality: In: Ahuja S. (ed.) Comprehensive Water Quality and Purification, vol. 1, p. 221-244.  Available Online

Clark, Gregory M., and Ott, D.S., 1996, Springflow effects on chemical loads in the Snake River, south-central Idaho: Journal of the American Water Resources Association, vol. 32, no. 3, June 1996, p. 553-563.  doi: 10.1111/j.1752-1688.1996.tb04053.x Available Online

Smith, Richard A., Alexander, Richard B., Tasker, Gary D., Price, Curtis V., Robinson, Keith W., and White, Dale A., 1993, Statistical modeling of water-quality in regional watersheds: Watershed '93, p. 751-754. 

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

Waite, I.R., Kennen, J.G., May, J.T., Brown, L.R., Cuffney, T.F., et al., 2014, Stream Macroinvertebrate Response Models for Bioassessment Metrics: Addressing the Issue of Spatial Scale: PLoS ONE 9(3): e90944,   doi:10.1371/journal.pone.0090944 Available Online

Asher, W., Bender, D.A., Zogorski, J.S., and Bartholomay, R.C., 2006, StreamVOC-A deterministic source-apportionment model to estimate volatile organic compound concentrations in rivers and streams: U.S. Geological Survey Scientific Investigations Report 2006-5110, 167 p.  Available Online

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

Wise, D.R., and Johnson, H.M., 2011, Surface-water nutrient conditions and sources in the United States Pacific Northwest: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p.  doi: 10.1111/j.1752-1688.2011.00580x Available Online

Gurdak, Jason J., Walvoord, Michelle A., and McMahon, Peter B., 2008, Susceptibility to enhanced chemical migration from depression-focused preferential flow, High Plains aquifer: Vadose Zone Journal, vol. 7, no. 4, p. 1172-1184.  doi: 10.2136/vzj2007.0145 Available Online

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