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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

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

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

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

Sprague, L.A., and Gronberg, J.M., 2013, Estimated anthropogenic nitrogen and phosphorus inputs to the land surface of the conterminous United States-1992, 1997, and 2002: U.S. Geological Survey Scientific Investigations Report 2012-5241, 14 p.  Available Online

Sprague, L.A., and Lorenz, D.L., 2009, Regional nutrient trends in streams and rivers of the United States, 1993-2003: Environmental Science and Technology, vol. 43, no. 10, p. 3430-3435.  doi: 10.1021/es803664x Available Online

Sprague, L.A., and Nowell, L.H., 2008, Comparison of pesticide concentrations in streams at low flow in six metropolitan areas of the United States: Environmental Toxicology and Chemistry, vol. 27, no. 2, p. 288-298.  doi: 10.1897/07-276 Available Online

Sprague, L.A., Harned, D.A., Hall, D.W., Nowell, L.H., Bauch, N.J., and Richards, K.D., 2007, Response of stream chemistry during base flow to gradients of urbanization in selected locations across the conterminous United States: U.S. Geological Survey Scientific Investigations Report 2007-5083, 132 p.  Available Online

Sprague, L.A., Mueller, D.K., Schwarz, G.E., and Lorenz, D.L., 2009, Nutrient trends in streams and rivers of the United States, 1993-2003: U.S. Geological Survey Scientific Investigations Report 2008-5202, 196 p.  Available Online

Sprague, Lori A., and Gronberg, JoAnn M., 2012, Relating management practices and nutrient export in agricultural watersheds of the United States: Journal of Environmental Quality, vol. 41, no. 6, p. 1939-1950.  doi: 10.2134/jeq2012.0073 Available Online

Squillace, P.J., and Moran, M.J., 2007, Factors associated with sources, transport, and fate of volatile organic compounds and their mixtures in aquifers of the United States: Environmental Science and Technology, vol. 41, no. 7, p. 2123-2130.  doi: 10.1021/es061079w 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, P.J., Zogorski, J.S., and Wilber, W.G., 1997, Preliminary assessment of the occurrence and possible sources of MTBE in groundwater in the United States, 1993-1994, U.S. Geological Survey: Chilton, John and others., eds., Congress on Groundwater in the Urban Environment, Nottingham, United Kingdom, Sept. 21-17 [Proceedings]: Netherlands, A.A. Balkema, p. 537-542. 

Squillace, Paul J., Moran, Michael J., and Price, Curtis V., 2004, VOCs in shallow groundwater in new residential/commercial areas of the United States: Environmental Science and Technology, vol. 38, no. 20, p. 5327-5338.  doi: 10.1021/es0349756 Available Online

Squillace, Paul J., Moran, Michael J., Lapham, Wayne W., Price, Curtis V., Clawges, Rick M., and Zogorski, John S., 1999, Volatile organic compounds in untreated ambient groundwater of the United States, 1985-95: Environmental Science and Technology, vol. 33, no. 23, p. 4176-4187.  doi: 10.1021/es990234m Available Online

Squillace, Paul J., Pankow, James F., Korte, Nic E., and Zogorski, John S., 1997, Review of the environmental behavior and fate of methyl tert-butyl ether: Environmental Toxicology and Chemistry, vol. 16, no. 9, September 1997, p. 1836-1844.  doi: 10.1897/1551-5028(1997)016<1836:ROTEBA>2.3.CO;2 Available Online

Squillace, Paul J., Pankow, James F., Korte, Nic E., and Zogorski, John S., 1996, Environment behavior and fate of methyl tert-butyl ether (MTBE): U.S. Geological Survey Fact Sheet 203-96, 6 p.  Available Online

Squillace, Paul J., Pope, Daryll A., and Price, Curtis A., 1995, Occurrence of the gasoline additive MTBE in shallow ground water in urban and agricultural areas: U.S. Geological Survey Fact Sheet 114-95, 4 p.  Available Online

Squillace, Paul J., Scott, Jonathon, Moran, Michael J., Nolan, B.T., and Kolpin, Dana W., 2002, VOCs, pesticides, nitrate, and their mixtures in groundwater used for drinking water in the United States: Environmental Science & Technology, vol. 36, no. 9, p. 1923-1930.  doi: 10.1021/es015591n Available Online

Squillace, Paul J., Zogorski, John S., Wilber, William G., and Price, Curtis V., 1995, A preliminary assessment of the occurrence and possible sources of MTBE in ground water of the United States, 1993-94: U.S. Geological Survey Open-File Report 95-456, 15 p.  Available Online

Squillace, Paul J., Zogorski, John S., Wilber, William G., and Price, Curtis V., 1996, A preliminary assessment of the occurrence and possible sources of MTBE in ground water of the United States, 1993-94: Environmental Science and Technology, vol. 30, no. 5, (also published as USGS Open-File Report 95-456), p. 1721-1730.  doi: 10.1021/es9507170 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

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, 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

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