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Potapova, M.G. and Charles, D.F., 2003, Distribution of benthic diatoms in U.S. rivers in relation to conductivity and ionic composition: Freshwater Biology, vol. 48, p. 1311-1328.  doi: 10.1046/j.1365-2427.2003.01080.x Available Online

Price, C.V., Nakagaki, N., Hitt, K.J., and Clawges, R.M., 2003, Mining GIRAS: Improving on a national treasure of land-use data: Proceedings: ESRI 2003 International User Conference, San Diego, CA, July 7-11, 2003, on-line conference proceedings.  Available Online

Rose, Donna L., and Sandstrom, Mark W., 2003, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory: determination of gasoline oxygenates, selected degradates, and BTEX in water by heated purge and trap/gas chromatography/mass spectrometry: U.S. Geological Survey Water-Resources Investigations Report 2003-4079, 31 p.  Available Online

Toccalino, Patricia, Nowell, Lisa, Wilber, William, Zogorski, John, Donohue, Joyce, Eiden, Catherine, Krietzman, Sandra, and Post, Gloria, 2003, Development of health-based screening levels for use in state- or local- scale water-quality assessments: U.S. Geological Survey Water-Resources Investigations Report 03-4054, 22 p.  Available Online

Welch, Alan H., and Stollenwerk, Kenneth G., eds., 2003, Arsenic in ground water-- geochemistry and occurrence: Boston, Kluwer Academic Publishers, 475 p.  Available Online

Alexander, Richard B., Johnes, Penny J., Boyer, Elizabeth W., and Smith, Richard A., 2002, A comparison of models for estimating the riverine export of nitrogen from large watersheds: Biogeochemistry, vol. 57, no. 58, p. 295-339.  doi: 10.1023/A:1015752801818 Available Online

Couch, Carol and Hamilton, Pixie, 2002, Effects of urbanization on stream ecosystems: U.S. Geological Survey Fact Sheet FS-042-02, 2 p.  Available Online

Dennehy, K.F., Litke, D.W., and McMahon, P.B., 2002, The High Plains aquifer, USA: Groundwater development and sustainability: In Hiscock, K.M., Rivett, M.O., and Davison, R.M. (eds.), Sustainable Groundwater Development, Geological Society, London, Special Publications, 193, p. 99-119. 

Erwin, Martha L., and Hamilton, Pixie A., 2002, Monitoring our rivers and streams: U.S. Geological Survey Fact Sheet 077-02, 4 p.  Available Online

Gilliom, Robert J., Mueller, David K., Zogorski, John S., and Ryker, Sarah J., 2002, A national look at water quality: Water Resources Impact, vol. 4, no. 4, July 2002, p. 12-16.  Available Online

Hamilton, Pixie, 2002, Water-quality patterns in some of the Nation's major river basins and aquifers: Water Resources Impact, vol. 4, no. 4, July 2002, p. 5-11.  Available Online

Hamilton, Pixie, and Miller, Timothy L., 2002, Managing the water above & below: Geotimes, May 2002, p. 21-24.  Available Online

Kolpin, D.W., Barbash, J.E. and Gilliom, R.J., 2002, Atrazine and metolachlor occurrence in shallow groundwater of the United States, 1993-95: Journal of the American Water Resources Association, vol. 38, no.1, p. 301-311.  doi: 10.1111/j.1752-1688.2002.tb01553.x Available Online

Madsen, James F., Sandstrom, Mark W., and Zaugg, Steven D., 2002, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory; a method supplement for the determination of Fipronil and degradates in water by gas chromatography/mass spectrometry: U.S. Geological Survey Open-File Report 2002-462, 11 p.  Available Online

Mallard, Gail E., and Hamilton, Pixie A., 2002, Monitoring and assessing our Nation's water quality: U.S. Geological Survey Fact Sheet 076-02, 6 p.  Available Online

Miller, Timothy L., 2002, Assessing the quality of the Nation's water resources: Water Resources Impact, vol. 4, no. 4, July 2002, p. 3-4.  Available Online

Moran, M.J., Clawges, R.M., and Zogorski, J.S., 2002, Methyl tert-butyl ether in ground and surface water of the United States: in Diaz, A.F., and Drogos, D.L., Oxygenates in Gasoline (Symposium Series 799): Washington, D.C., American Chemical Society, p 2-16. 

Moran, Michael J., Lapham, Wayne W., Rowe, Barbara L., and Zogorski, John S., 2002, Occurrence and status of volatile organic compounds in ground water from rural, untreated, self-supplied domestic wells in the United States, 1986-99: U.S. Geological Survey Water-Resources Investigations Report 02-4085, 51 p.  Available Online

Mueller, David K., Lapham, Wayne W., Gurtz, Martin E., and Van Metre, Peter C., 2002, Changes in water quality over time: Water Resources Impact, vol. 4, no. 4, July 2002, p. 22-25.  Available Online

National Research Council, 2002, Opportunities to improve the U.S.G.S. National Water-Quality Assessment Program: National Academy Press, Washington, D.C., 238 p.  Available Online

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

Potapova, M.G., and Charles, D.F., 2002, Benthic diatoms in USA rivers: distributions along spatial and environmental gradients: Journal of Biogeography, vol. 29, p. 167-187.  doi: 10.1046/j.1365-2699.2002.00668.x 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

Wilber, William G., and Couch, Carol A., 2002, Assessing five national priorities in water resources: Water Resources Impact, vol. 4, no. 4, July 2002, p. 17-21.  Available Online

Wolock, David M., and Kauffman, Leon K., 2002, Estimating water-quality conditions in unmonitored water resources: Water Resources Impact, vol. 4, no. 4, July 2002, p. 26-31.  Available Online

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