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Soltero, S., Garcia, A.M., Cuffney, T., and McMahon, G., 2010, Effects of urbanization on stream ecosystems (Spanish EUSE Radio WALO 1): U.S. Geological Survey Multimedia Gallery Home Audio 368, 13 minutes.  Available Online

Soltero, S., Diaz, P., Douglas, R. and Ortiz, M., 2010, Effects of urbanization on stream ecosystems (Spanish EUSE Radio WALO 2): U.S. Geological Survey Multimedia Gallery Home Audio 384, 33 minutes.  Available Online

Smith, Stephen B., 1998, Investigations of endocrine disruption in aquatic systems associated with the National Water-Quality Assessment (NAWQA) Program: U.S. Geological Survey Fact Sheet FS-081-98, 4 p.  Available Online

Smith, Richard A., Schwarz, Gregory E., and Alexander, Richard B., 1997, Regional interpretation of water-quality monitoring data: Water Resources Research, December 1997, vol. 33, no. 12, p. 2781-2798.  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. 

Skinner, K.D., and Rupert, M.G., 2012, Numerical model simulations of nitrate concentrations in groundwater using various nitrogen input scenarios, mid-Snake region, south-central Idaho: U.S. Geological Survey Scientific Investigations Report 2012-5237, 30p.  Available Online

Short, T.M., Giddings, E.M.P., Zappia, Humbert, and Coles, J.F., 2005, Urbanization effects on stream habitat characteristics in: Boston, Massachusetts; Birmingham, Alabama, and Salt Lake City, Utah: in Brown, L.R., Gray, R.H., Hughes, R.M., and Meador, M.R., eds., Effects of Urbanization on Stream Ecosystems: AFS Symposium 47, American Fisheries Society, p. 317-332.  Available Online

Shih, Jhih-Shyang, Alexander, R.B., Smith, R.A., Boyer, E.W., Schwarz, G.E., and Chung, Susie, 2010, An initial SPARROW model of land use and in-stream controls on total organic carbon in streams of the conterminous United States: U.S. Geological Survey Open-File Report 2010-1276, 22 p.  Available Online

Sheets, R.A., 2007, Hydrogeologic Setting and Ground-Water Flow Simulations of the Great Miami River Basin Regional Study Area, Ohio, Section 7 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. 7-1 to 7-21.  Available Online

Scudder, B.C., Chasar, L.C., Wentz, D.A., Bauch, N.J., Brigham, M.E., Moran, P.W., and Krabbenhoft, D.P., 2009, Mercury in fish, bed sediment, and water from streams across the United States, 1998-2005: U.S. Geological Survey Scientific Investigations Report 2009-5109, 74 p.  Available Online

Scudder, B.C., Chasar, L.C., DeWeese, L.R., Brigham, M.E., Wentz, D.A., and Brumbaugh, W.G., 2008, Procedures for collecting and processing aquatic invertebrates and fish for analysis of mercury as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 2008-1208, 34 p.  Available Online

Scudder Eikenberry, B.C., Riva-Murray, Karen, Smith, M.J., Bradley, P.M., Button, D.T., Clark, J.M., Burns, D.A., and Journey, C.A., 2012, Environmental settings of selected streams sampled for mercury in New York and South Carolina, 2005-09: U.S. Geological Survey Open-File Report 2011-1318, 36 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

Schwarz, G.E., Alexander, R.B., Smith, R.A., and Preston, S.D., 2011, The regionalization of national-scale SPARROW models for stream nutrients: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 22 p.  doi: 10.1111/j.1752-1688.2011.00581.x Available Online

Schelker, J., Burns, D.A., Weiler, M., and Laudon, H., 2011, Hydrological mobilization of mercury and dissolved organic carbon in a snow-dominated, forested watershed: Conceptualization and modeling : Journal of Geophysical Research, vol. 116, G01002, 17 p.  doi:10.1029/2010JG001330 Available Online

Schapp, Bryan D., and Zogorski, John S., 2006, Occurrence of trihalomethanes in the Nation's ground water and drinking-water supply wells, 1985-2002: U.S. Geological Survey Scientific Investigations Report 2006-5068, 64 p.  Available Online

Schaefer, D.H., Green,J.M., and Rosen, M.R., 2007, Hydrogeologic Settings and Ground-Water Flow Simulations of the Eagle Valley and Spanish Springs Valley Regional Study Areas, Nevada, Section 3 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. 3-1 to 3-31.  Available Online

Scanlon, B.R., Reedy, R.C., Stonestrom, D.A., Prudic, D.E., and Dennehy, K.F., 2005, Impact of land use and land cover change on groundwater recharge and quality in the southwestern US: Global Change Biology, vol. 11, p. 1577-1593.  doi: 10.1111/j.1365-2486.2005.01026.x Available Online

Sauer, T.J., Alexander, R.B., Brahana, J.V., and Smith, R.A., 2001, The importance and role of watersheds in the transport of nitrogen: in Follett, R.F. and Hatfield, J.L., eds., Chapter 7 Nitrogen in the Environment: Elsevier, p. 147-181.  Available Online

Sargent, B. Pierre, Maupin, Molly A., and Hinkle, Stephen R., 2008, Estimated Withdrawals from Stream-Valley Aquifers and Refined Estimated Withdrawals from Selected Aquifers in the United States, 2000: USGS Scientific Investigations Report 2008-5003, 71 p.  Available Online

Sandstrom, Mark W., Stroppel, Max E., Foreman, William T., and Schroeder, Michael P., 2001, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory - determination of moderate-use pesticides and selected degradates in water by C-18 solid-phase extraction and gas chromatography/mass spectrometry : U.S. Geological Survey Water-Resources Investigations Report 2001-4098, 70 p.  Available Online

Sandstrom, Mark W., 1995, Filtration of water-sediment samples for the determination of organic compounds: U.S. Geological Survey Water-Resources Investigations Report 95-4105, 13 p.  Available Online

Saleh, D.K., Kratzer, C.R., Green, C.H., and Evans, D.G., 2009, Using the Soil and Water Assessment Tool (SWAT) to simulate runoff in Mustang Creek Basin, California: U.S. Geological Survey Scientific Investigations Report 2009-5031, 28 p.  Available Online

Saad, D.A., Schwarz, G.E., Robertson, D.M., and Booth, N.L., 2011, A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 17 p.  doi: 10.1111/j.1752-1688.2011.00575.x Available Online

Ryberg, K.R., Vecchia, A.V., Martin, J.D., and Gilliom, R.J., 2010, Trends in pesticide concentrations in urban streams in the United States, 1992-2008: U.S. Geological Survey Scientific Investigations Report 2010-5139, 101 p.  Available Online

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