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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

Steele, G.V., Johnson, H.M., Sandstrom, M.W., Capel, P.D., and Barbash, J.E., 2008, Occurrence and fate of pesticides in four contrasting agricultural settings in the United States: Journal of Environmental Quality, vol. 37, p. 1116-1132.  doi: 10.2134/jeq2007.0166 Available Online

Stets, E.G., Kelly, V.J., Broussad, W.P., III, Smith, T.E., and Crawford, C.G., 2012, Century-scale perspective on water quality in selected river basins of the conterminous United States: U.S. Geological Survey Scientific Investigations Report 2012-5225, 108 p.  Available Online

Stets, E.G., Kelly, V.J., Crawford, C.G., 2014, Long-term trends in alkalinity in large rivers of the conterminous US in relation to acidification, agriculture, and hydrologic modification: Science of The Total Environment, Volumes 488-489, 1 August 2014, p. 280-289.  DOI: 10.1016/j.scitotenv.2014.04.054 Available Online

Steuer, J.J., 2010, A generalized watershed disturbance-invertebrate relation applicable in a range of environmental settings across the continental United States: Urban Ecosystems, 10 p.  doi: 10.1007/s11252-010-0131-x Available Online

Steuer, J.J. Stensvold, K.A., and Gregory, M.B., 2010, Determination of biologically significant hydrologic condition metrics in urbanizing watersheds: an empirical analysis over a range of environmental settings: Hydrobiologia, vol. 654, no. 1, 34 p., online only.  doi: 10.1007/s10750-010-0362-0 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

Stewart, Jana S., 1994, Assessment of alternative methods for stratifying landsat TM data to improve land cover classification accuracy across areas with physiographic variation: University of Wisconsin-Madison, Master of Science thesis, 159 p. 

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., 2013, Estimated annual agricultural pesticide use for counties of the conterminous United States, 1992-2009: U.S. Geological Survey Data Series 752, 1 p.  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., and Wilson, J.T., 2006, Preferential flow estimates to an agricultural tile drain with implications for glyphosate transport: Journal of Environmental Quality, vol. 35, no. 5, p. 1825-1835.  doi:10.2134/jeq2006.0068 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, W.W., Gilliom, R.J., and Martin, J.D., 2014, An overview comparing results from two decades of monitoring for pesticides in the Nation's streams and rivers, 1992-2001 and 2002-2011: U.S. Geological Survey Scientific Investigations Report 2014-5154, 23 p.  doi.org/10.3133/sir20145154 Available Online

Stone, W.W., Gilliom, R.J., and Ryberg, K.R., 2014, Pesticides in U.S. Streams and Rivers: Occurrence and Trends during 1992-2011: Environmental Science & Technology, 48 (19), p. 11025-11030.  DOI: 10.1021/es5025367 Available Online

Stoner, J.D., Cowdery, T.K., and Puckett, L.J., 1997, Ground-water age dating and other tools used to assess land-use effects on water quality: U.S. Geological Survey Water-Resources Investigations Report 97-4150, 6 p.  Available Online

Szabo, Zoltan, dePaul, Vincent T., Fischer, Jeffrey M., Kraemer, Thomas F., and Jacolsen, Eric, 2012, Occurrence and geochemistry of radium in water from principal drinking-water aquifer systems of the United States: Applied Geochemistry, vol. 27, Issue 3, March 2012, p. 729-752.  doi: 10.1016/j.apgeochem.2011.11.002 Available Online

Szabo, Zoltan, Fischer, J.M., and Hancock, T.C., 2012, Principal aquifers can contribute radium to sources of drinking water under certain geochemical conditions: U.S. Geological Survey Fact Sheet 2010-3113, 6 p.  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, McMahon, Gerard, and Bell, A.H., 2012, Representation of regional urban development conditions using a watershed-based gradient study design: U.S. Geological Survey Scientific Investigations Report 2012-5070, 109 p.  Available Online

Tesoriero, A.J., Duff, J.H., Saad, D.A., Spahr, N.E., and Wolock, D.M., 2013, Vulnerability of streams to legacy nitrate sources: Environmental Science and Technology, vol. 47, no. 8, p. 3623-3629.  Available Online

Tesoriero, Anthony J., and Puckett, Larry J., 2011, O2 reduction and denitrification rates in shallow aquifers: Water Resources Research, vol. 47, W12522, 17 p.  doi: 10.1029/2011WR010471 Available Online

Tesoriero, Anthony J., Duff, J.H., Wolock, D.M., Spahr, N.E., and Almendinger, J.E., 2009, Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds: Journal of Environmental Quality, vol. 38, p. 1892-1900.  doi: 10.2134/jeq2008.0484 Available Online

Tesoriero, Anthony J., Inkpen, Emily L., and Voss, Frank D., 1998, Assessing groundwater vulnerability using logistic regression: Source Water Assessment and Protection 98, A Technical Conference April 28-20,1998, p. 157-165.  Available Online

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