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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

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. 

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

Spahr, N.E., Mueller, D.K., and Wolock, D.W., Hitt, K.J., and Gronberg, J.M., 2010, Development and application of regression models for estimating nutrient concentrations in streams of the conterminous United States, 1992-2001: U.S. Geological Survey Scientific Investigations Report 2009-5199, 22 p.  Available Online

Squillace, P.J., and Moran, M.J., 2006, Factors associated with sources, transport, and fate of volatile organic compounds in aquifers of the United States and implications for ground-water management and assessments: U.S. Geological Survey Scientific Investigations Report 2005-5269, 40 p.  Available Online

Squillace, Paul J., and Moran, Michael J., 2000, Estimating the likelihood of MTBE occurrence in drinking water supplied by ground-water sources in the Northeast and Mid-atlantic regions of the United States: U.S. Geological Survey Open-File Report 00-343, 10 p.  Available Online

Stackelberg, P.E., Gilliom, R.J., Wolock, D.M., and Hitt, K.J., 2006, Development and application of a regression equation for estimating the occurrence of atrazine in shallow ground water beneath agricultural areas of the United States: U.S. Geological Survey, Scientific Investigations Report 2005-5287, 12 p.  Available Online

Stackelberg, Paul E., Barbash, Jack E., Gilliom, Robert J., Stone, Wesley W., and Wolock David M., 2012, Regression models for estimating concentrations of atrazine plus deethylatrazine in shallow groundwater in agricultural areas of the United States: Journal of Environmental Quality, vol. 41, no. 2, 16 p.  doi:10.2134/jeq2011.0200 Available Online

Stackelburg, Paul E., 1997, Presence and distribution of chlorinated organic compounds in streambed sediments, New Jersey: American Water Resources Association, vol. 33, no. 2, p 271-284.  doi: 10.1111/j.1752-1688.1997.tb03508.x Available Online

Starn, J.J., and Brown, C.J., 2007, Simulations of ground-water flow and residence time near Woodbury, Connecticut: U.S. Geological Survey Scientific Investigations Report 2007-5210, 56 p.  Available Online

Starn, J.J., Bagtzoglou, A.C., and Robbins, G.A., 2010, Using atmospheric tracers to reduce uncertainty in groundwater recharge areas: Ground Water, vol. 48, no. 6, p. 858-868.  doi: 10.1111/j.1745-6584.2010.00674.x Available Online

Starn, J.J., Green, C.T., Hinkle, S.R., Bagtzoglou, A.C., Stolp, B.J., 2014, Simulating water-quality trends in public-supply wells in transient flow systems: Groundwater, vol. 52, p. 53-62.  doi: 10.1111/gwat.12230 Available Online

Starn, Jeffrey J., Bagtzoglou, Amvrossios C., and Robbins, Gary A., 2012, Methods for simulating solute breakthrough curves in pumping groundwater wells: Computers & Geoscience, online in advance of print, January 2012, 12 p.  10.1016/j.cageo.2012.01.011 Available Online

Starn, Jeffrey, Bagtzoglou, Amvrossios C., 2011, Programs for calibration-based Monte Carlo simulation of recharge areas: Ground Water, online in advance of print, October 2011, 5 p.  10.1111/j.1745-6584.2011.00868.x Available Online

Steuer, J.J., Bales, J.D., and Giddings, E.M.P., 2009, Relationship of stream ecological conditions to simulated hydraulic metrics across a gradient of basin urbanization: Journal North American Benthological Society, vol. 28, no. 4, p. 955-976.  doi: 10.1899/08-157.1 Available Online

Stolp, B.J. , 2007, Hydrogeologic Setting and Ground-Water Flow Simulations of the Salt Lake Valley Regional Study Area, Utah, Section 2 in Paschke, S.S., ed., 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. 2-1 to 2-22.  Available Online

Stone, W.W., and Gilliom, R.J., 2012, Watershed Regressions for Pesticides (WARP) models for predicting atrazine concentrations in corn belt streams: Journal of the American Water Resources Association, vol. 48, no. 5, p. 970-986.  doi: 10.1111/j.1752-1688.2012.00661.x Available Online

Stone, W.W., and Gilliom, R.J., 2009, Update of watershed regressions for pesticides (WARP) for predicting atrazine concentration in streams: U.S. Geological Survey Open-File Report 2009-1122, 22 p.  Available Online

Stone, W.W., Crawford, C.G., and Gilliom, R.J, 2013, Watershed Regressions for Pesticides (WARP) models for predicting stream concentrations of multiple pesticides: Journal of Environmental Quality, vol. 42 no. 6, p. 1838-1851.   doi:10.2134/jeq2013.05.0179 Available Online

Stone, W.W., Gilliom, R.J., and Crawford, C.G., 2008, Watershed Regressions for Pesticides (WARP) for predicting annual maximum and maximum moving-average concentrations of atrazine in streams: U.S. Geological Survey Open-File Report 2008-1186, 19 p.  Available Online

Stone, Wesley W., and Gilliom, Robert J., 2011, Watershed regressions for pesticides (WARP) for predicting atrazine concentration in Corn Belt streams: U.S. Geological Survey Open-File Report 2011-1141, 18 p.  Available Online

Sullivan, Daniel J., 2000, Fish communities and their relation to environmental factors in the Eastern Iowa Basins in Iowa and Minnesota, 1996: U.S. Geological Survey Water-Resources Investigations Report 00-4194, 20 p.  Available Online

Tate, C.M., and Heiny, J.S., 1995, The ordination of benthic invertebrate communities in the South Platte River Basin in relation to environmental factors: Freshwater Biology, vol. 33, no. 3, Denver, Colorado, p 439-454.  doi: 10.1111/j.1365-2427.1995.tb00405.x Available Online

Tate, C.M., Cuffney, T.F., McMahon, Gerald, Giddings, E.M.P., Coles, J.R., and Zappia, Humbert, 2005, Use of an urban intensity index to assess urban effects on streams in three contrasting environmental settings: 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. 291-315.  Available Online

Terziotti, Silvia, Hoos, A.B., Harned, D.A., and Garcia, A.M., 2010, Mapping watershed potential to contribute phosphorus from geologic materials to receiving streams, southeastern United States: U.S. Geological Survey Scientific Investigations Map 3102, 1 p.  Available Online

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