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Nolan, Bernard T., Hitt, Kerie J., and Ruddy, Barbara C., 2002, Probability of nitrate contamination of recently recharged groundwaters in the conterminous United States: Environmental Science & Technology, vol. 36, no. 10, p. 2138-2145.  doi: 10.1021/es0113854 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

Preston, S.D., Alexander, R.B., and Woodside, M.D., 2011, Regional assessments of the Nation's water quality--Improved understanding of stream nutrient sources through enhanced modeling capabilities: U.S. Geological Survey Fact Sheet 2011-3114, 6 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

McMahon, P.B., and Böhlke, J.K., 2006, Regional patterns in the isotopic composition of natural and anthropogenic nitrate in ground water, High Plains, USA: Environmental Science & Technology, vol. 40, p. 2965-2970.  doi: 10.1021/es052229q Available Online

Nowell, L.H., Crawford, C.G., Nakagaki, N., Thelin, G.P., and Wolock, D.M., 2006, Regression model for explaining and predicting concentrations of dieldrin in whole fish from United States streams: U.S. Geological Survey Scientific Investigations Report 2006-5020, 40 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

Larson, Steven J., and Gilliom, Robert J., 2001, Regression models for estimating herbicide concentrations in U.S. streams from watershed characteristics: Journal of the American Water Resources Association, vol. 37, no. 5, p. 1349-1367.  doi: 10.1111/j.1752-1688.2001.tb03644.x Available Online

Nowell, L.H., Crawford, C.G., Gilliom, R.J., Nakagaki, N., Stone, W.W., Thelin, G.P., Wolocks, D.M., 2009, Regression models for explaining and predicting concentrations of organochlorine pesticides in fish from streams in the United States: Environmental Toxicology and Chemistry, vol. 28, no. 6, p. 1346-1358.  doi: 10.1897/08-508.1 Available Online

Nolan, Bernard T., 2001, Relating nitrogen sources and aquifer susceptibility to nitrate in shallow ground waters of the United States: Ground Water, vol. 39, no. 2, p. 290-299.  Available Online

Frick, E.A., and Buell, Gary R., 1999, Relation of land use to nutrient and suspended-sediment concentrations, loads, and yields in the upper Chattahoochee River Basin, Georgia, 1993-98: in Hatcher, K.J., ed., U.S. Geological Survey reprints from proceedings of the 1999 Georgia Water Resources Conference, March 30-31,1999 The University of Georgia, Athens, Georgia, p. 170-179. 

Kennen, Jonathan G., 1999, Relation of macroinvertebrate community impairment to catchment characteristics in New Jersey streams: Journal of the American Water Resources Association, vol. 35, no. 4, p. 939-955  doi: 10.1111/j.1752-1688.1999.tb04186.x Available Online

Meador, M.R., and Carlisle, D.M., 2011, Relations between altered streamflow variability and fish assemblages in Eastern USA streams: River Research and Applications , 10 p., online in advance of print.  doi: 10.1002/rra.1534 Available Online

Carpenter, Kurt D., and Waite, Ian R., 2000, Relations of habitat-specific algal assemblages to land use and water chemistry in the Willamette Basin, Oregon: Environmental Monitoring and Assessment, vol. 64, no. 1, p. 247-257.  doi: 10.1023/A:1006460802772 Available Online

Warner, K.L., and Arnold, T.L., 2010, Relations that affect the probability and prediction of nitrate concentration in private wells in the glacial aquifer system in the United States: U.S. Geological Survey Scientific Investigations Report 2010-5100, 55 p., plus appendixes.  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

Goldstein, R.M., Meador, M.R., and Ruhl, K.E., 2007, Relative influence of streamflows in assessing temporal variability in stream habitat: Journal of the American Water Resources Association, vol. 43, p. 642-650.  doi: 10.1111/j.1752-1688.2007.00051.x Available Online

Robertson, D.M., and Saad, D.A., 2013, Reply to Discussion - "Nutrient Inputs to the Laurentian Great Lakes by Source and Watershed Estimated Using SPARROW Watershed Models" by R. Peter Richards, Ibrahim Alameddine, J. David Allan, David B. Baker, Nathan S. Bosch, Remegio Confesor, Joseph V. DePinto, David M. Dolan, Jeffrey M. Reutter, and Donald Scavia: Journal of the American Water Resources Association (JAWRA), v. 49, no. 3, p. 725-734.  DOI: 10.1111/jawr.12060 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

Powell, Jeffrey R., 2003, Response of fish communities to cropland density and natural environmental setting in the Eastern Highland Rim Ecoregion of the lower Tennessee River Basin, Alabama and Tennessee, 1999: U.S. Geological Survey Water-Resources Investigations Report 02-4268, 48 p.  Available Online

Cuffney, Thomas F., Meador, Michael R., Porter, Stephen D., and Gurtz, Martin E., 2000, Responses of physical, chemical, and biological indicators of water quality to a gradient of agricultural land use in the Yakima River Basin, Washington: Environmental Monitoring and Assessment, vol. 64, p. 259-270.  doi: 10.1023/A:1006473106407 Available Online

Anning, D.W., Bauch, N.J., Gerner, S.J., Flynn, M.E., Hamlin, S.N., Moore, S.J., Schaefer, D.H., Anderholm, S.K., and Spangler, L.E., 2007, revised 2010, Dissolved solids in basin-fill aquifers and streams in the southwestern United States: U.S. Geological Survey Scientific Investigations Report 2006-5315, v. 1.1, 168 p.  Available Online

Nolan, Bernard T., Ruddy, Barbara C., Hitt, Kerie J., and Helsel, Dennis R., 1997, Risk of nitrate in ground waters of the United States-- A national perspective: Environmental Science and Technology, vol. 31, no. 8, p. 229-236.  doi: 10.1021/es960818d Available Online

Woods, Paul F., 2004, Role of limnological processes in fate and transport of nitrogen and phosphorus loads delivered into Coeur d'Alene Lake and Lake Pend Oreille, Idaho, and Flathead Lake, Montana: U.S. Geological Survey Professional Paper 1682, 44 p.  Available Online

Ryberg, K.R., and Vecchia, A.V., 2013, seawaveQ-An R package providing a model and utilities for analyzing trends in chemical concentrations in streams with a seasonal wave (seawave) and adjustment for streamflow (Q) and other ancillary variables: U.S. Geological Survey Open-File Report 2013-1255, 13 p.  Available Online

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