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Puckett, Larry J., Tesoriero, Anthony J., and Dubrovsky, Neil M., 2010, Nitrogen contamination of surficial aquifers - - A growing legacy: Environmental Science and Technology, vol. 45, no. 3, p. 839-844.  doi: 10.1021/es1038358 Available Online

Green, C.T., Fisher, L.H., and Bekins, B.A., 2008, Nitrogen fluxes through unsaturated zones in five agricultural settings across the United States: Journal of Environmental Quality, vol. 37, p. 1073-1085.  doi: 10.2134/jeq2007.0010 Available Online

Burkart, M.R., and Stoner, J.D., 2001, Nitrogen in groundwater associated with agricultural systems : in Follett, R.F. and Hatfield, J.L., eds., Chapter 6 Nitrogen in the Environment: Elsevier, p. 123-145.  Available Online

Bonn, Bernadine A., Wentz, Dennis A., and Hinkle, Stephen R., 1996, Nitrogen in streams and ground water, 1980-90: U.S. Geological Survey Open-File Report 96-227, 4 p.  Available Online

Hinkle, S.R., and Tesoriero, A.J., 2014, Nitrogen speciation and trends, and prediction of denitrification extent, in shallow US groundwater: Journal of Hydrology, vol. 509, p. 343-353.  Available Online

Weeks, E.P., and McMahon, P.B., 2007, Nitrous oxide fluxes from cultivated areas and rangeland: U.S. High Plains: Vadose Zone Journal, vol. 6, p. 496-510.  doi: 10.2136/vzj2006.0164 Available Online

Puckett, Larry J., 1994, Nonpoint and point sources of nitrogen in major watersheds of the United States: U.S. Geological Survey Water-Resources Investigations Report 94-4001, 9 p.  Available Online

Lopes, Thomas J., and Bender, David A., 1998, Nonpoint sources of volatile organic compounds in urban areas--Relative importance of land surfaces and air: Environmental Pollution, vol. 101 (1998), p. 221-230.  doi: 10.1016/S0269-7491(98)00048-7 Available Online

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

Clark, Gregory M., Mueller, David K., and Mast M. Alisa, 2000, Nutrient concentrations and yields in undeveloped stream basins of the United States: Journal of the American Water Resources Association, vol. 36, no. 4, August 2000, p. 849-860.  doi: 10.1111/j.1752-1688.2000.tb04311.x Available Online

Robertson, D.M., and Saad, D.A., 2001, Nutrient inputs to the Laurentian Great Lakes by source and watershed estimated using SPARROW watershed models: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 23 p.  doi: 10.1111/j.1752-1688.2011.00574.x Available Online

Maupin, M.A., and Ivahnenko, T., 2011, Nutrient loadings to streams of the continental United States from municipal and industrial effluent: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 15 p.  doi: 10.1111/j.1752-1688.2011.00576.x Available Online

Brown, J.B., Sprague, L.A., and Dupree, J.A., 2011, Nutrient sources and transport in the Missouri River Basin, with emphasis on the effects of irrigation and reservoirs: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 27 p.  doi: 10.1111/j.1752-1688.2011.00584.x 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

Dubrovsky, N.M., and Hamilton, P.A., 2010, Nutrient's in the Nation's streams and groundwater: National Findings and Implications: U.S. Geological Survey Fact Sheet 2010-3078, 6 p.  Available Online

Mueller, David K., Hamilton, Pixie A., Helsel, Dennis R., Hitt, Kerie J., and Ruddy, Barbara C., 1995, Nutrients in ground water and surface water of the United States--An analysis of data through 1992: U.S. Geological Survey Water-Resources Investigations Report 95-4031, 74 p.  Available Online

Nolan, Bernard T., and Stoner, Jeffrey D., 2000, Nutrients in groundwaters of the conterminous United States, 1992-1995: Environmental Science and Technology, vol. 34, no. 7, p. 1156-1165.  doi: 10.1021/es9907663 Available Online

Nolan, Bernard T., and Hitt, Kerie J., 2003, Nutrients in shallow ground waters beneath relatively undeveloped areas in the conterminous United States: U.S. Geological Survey Water-Resources Investigations Report 02-4289, 17 p.  Available Online

Mueller, D.K., and Spahr, N.E., 2006, Nutrients in streams and rivers across the Nation: U.S. Geological Survey Scientific Investigations Report 2006-5107, 44 p.  Available Online

Dubrovsky, N.M., and Capelli, K.L., 2010, Nutrients in the Nation's Streams and Groundwater: U.S. Geological Survey Multimedia Gallery Home Audio 372, 8 minutes.  Available Online

Mueller, David K., and Helsel, Dennis R., 1996, Nutrients in the Nation's water--Too much of a good thing?: U.S. Geological Survey Circular 1136, 24 p.  Available Online

Graffy, Elisabeth A., Helsel, Dennis R., and Mueller, David K., 1996, Nutrients in the Nation's waters: Identifying problems and progress: U.S. Geological Survey Fact Sheet 218-96, 6 p.  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

Francy, Donna S., Helsel, Dennis H., and Nally, Rebecca A., 2000, Occurrence and distribution of microbiological indicators in ground water and stream water: Water Environment Research, vol. 72, no. 2, p. 152-161.  doi: 10.2175/106143000X137220 Available Online

Lopes, Thomas J. Furlong, Edward T., and Pritt, Jeffrey W., 1997, Occurrence and distribution of semivolatile organic compounds in stream bed sediments, United States, 1992-95: in Little, E.E., DeLonay, A.J., and Greenberg, B.M., eds., Environment Toxicology and Risk Assessment: Seventh Volume, ASTM STP 1333, 1998. 

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