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Alexander, R.B., Smith, R.A., Schwarz, G.S., Boyer, E.W., Nolan, J.V., and Brakebill, J.W., 2008, Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin: Environmental Science and Technology, vol. 42, no. 3, p. 822-830.  doi: 10.1021/es0716103 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

Alexander, Richard B., Smith, Richard A., and Schwarz, Gregory E., 2000, Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico: Nature, vol. 403, February 17, 2000, p. 758-761.  Available Online

Anderson, Robert M.,Beer, Kevin M., Buckwalter, Theodore F., Clark, Mary E., McAuley, Steven D., Sams III, James I., Williams, Donald R., 2001, Water quality in the Allegheny and Monongahela River Basins, Pennsylvania, West Virginia, New York, and Maryland, 1996-98: U.S. Geological Survey Circular 1202, 32 p.  Available Online

Arnold, T.L., Warner, K.L., Groschen, G.E., Caldwell, J.P., and Kalkhoff, S.J., 2008, Hydrochemical regions of the glacial aquifer system, northern United States, and their environmental and water-quality characteristics: U.S. Geological Survey Scientific Investigations Report 2008-5015, 84 p.  Available Online

Ator, S.W., Brakebill, J.W., and Blomquist, J.D., 2011, Sources, fate, and transport of nitrogen and phosphorus in the Chesapeake Bay Watershed - An empirical model: U.S. Geological Survey Scientific Investigations Report 2011-5167, 27 p.  Available Online

Ator, Scott W., 1998, Nitrate and pesticide data for waters of the Mid-Atlantic Region: U.S. Geological Survey Open-File Report 98-158, 5 p.  Available Online

Ator, Scott W., and Denis, Janet M., 1997, Relation of the nitrogen and phosphorus in ground water to land use in four subunits of the Potomac River Basin: U.S. Geological Survey Water-Resources Investigations Report 96-4268, 26 p.  Available Online

Ator, Scott W., and Denver, Judith M., 2012, Estimating contributions of nitrate and herbicides from groundwater to headwater streams, Northern Atlantic Coastal Plain, United States: Journal of the American Water Resources Association, online 20Sept2012 in advance of print, 16 p.  doi: 10.1111 /j.1752-1688.2012.00672.x Available Online

Ator, Scott W., and Ferrari, and Matthew J., 1997, Nitrate and selected pesticides in ground water of the Mid-Atlantic Region: U.S. Geological Survey Water-Resources Investigations Report 97-4139, 8 p.  Available Online

Ator, Scott W., Blomquist, Joel D., Brakebill, John W., Denis, Janet M., Ferrari, Matthew J., Miller, Cherie V., and Zappia, Humbert, 1998, Water quality in the Potomac River Basin, Maryland, Pennsylvania, Virginia, West Virginia, and the District of Columbia, 1992-96: U.S. Geological Survey Circular 1166, 38 p.  Available Online

Ayotte, J.D., Flanagan, S.M., and Morrow, W.S., 2007, Occurrence of uranium and 222radon in glacial and bedrock aquifers in the northern United States, 1993-2003: U.S. Geological Survey Scientific Investigations Report 2007-5037, 84 p.  Available Online

Bartholomay, Roy C., Carter, Janet M., Qi, Sharon L., Squillace, Paul J., and Rowe, Gary L., 2007, Summary of selected U.S. Geological Survey data on domestic well water quality for the Centers for Disease Control's National Environmental Public Health Tracking Program: U.S. Geological Survey Scientific Investigations Report 2007-5213, 57 p.  Available Online

Bickford, Tammy M., Lindsey, Bruce D., and Beaver, Mark R., 1996, Bacteriological quality of ground water used for household supply, Lower Susquehanna River Basin, Pennsylvania and Maryland: U.S. Geological Survey Water-Resources Investigations Report 96-4212, 31 p.  Available Online

Bilger, Michael D., and Brightbill, Robin A., 1998, Fish communities and their relation to physical and chemical characteristics of streams from selected environmental settings in the Lower Susquehanna River Basin, 1993-95: U.S. Geological Survey Water-Resources Investigations Report 98-4004, 34 p.  Available Online

Bilger, Michael D., Brightbill, Robin A., and Campbell, Harry L., 1999, Occurrence of organochlorine compounds in whole fish tissue from streams of the Lower Susquehanna River Basin, Pennsylvania and Maryland, 1992: U.S. Geological Survey Water-Resources Investigations Report 99-4065, 17 p.  Available Online

Blomquist, J.D., Fisher, G.T., Denis, J.M., Brakebill, J.W., and Werkheiser, W.H., 1996, Water-quality assessment of the Potomac River Basin: Basin description and analysis of available nutrient data, 1970-90: U.S. Geological Survey Water-Resources Investigations Report 95-4221, 88 p.   Available Online

Brayton, Michael J., Denver, Judith M., Delzer, Gregory C., and Hamilton, Pixie A., 2008, Organic Compounds in Potomac River Water Used for Public Supply near Washington, D.C., 2003-05: U.S. Geological Survey Fact Sheet FS 2007-3085, 6 p.  Available Online

Breen, K.J., Hainly, R.A., and Hoffman, S.A., 1991, National Water-Quality Assessment Program--The Lower Susquehanna River Basin: U.S. Geological Survey Open-File Report 91-168, 2 p.  Available Online

Breen, Kevin J., Gavin, Andrew J., and Schnabel, Ronald R., 1994, Occurrence and yields of triazine herbicides in the Susquehanna river and tributaries during base-flow conditions in the Lower Susquehanna River Basin, Pennsylvania and Maryland, June 1993: Hill, Paula, and Nelson, Steve, eds., Toward a sustainable watershed--The Chesapeake experiment, proceedings of the 1994 Chesapeake research conference, Norfolk, Virginia, June 1-3, 1994: Edgewater, Maryland, Chesapeake Research Consortium Publication No. 149, p. 312-328. 

Brightbill, Robin A., and Bilger, Michael D., 1998, Relation of algal biomass to characteristics of selected streams in the Lower Susquehanna River Basin: U.S. Geological Survey Water-Resources Investigations Report 98-4144, 18 p.  Available Online

Callender, E., 2000, Geochemical effects of rapid sedimentation in aquatic systems: minimal diagenesis and the preservation of historical metal signatures: Journal of Paleolimnology, vol. 23, p. 243-260.  doi: 10.1023/A:1008114630756 Available Online

Capel, Paul D., and Larson, Steven J., 2001, Effect of scale on the behavior of atrazine in surface waters: Environmental Science & Technology, vol. 35, no. 4, p. 648-657.  doi: 10.1021/es001123m Available Online

Carlisle, D.M., and Meador, M.R., 2007, A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages: Journal of the American Water Resources Association, vol. 43, p. 1194-1207.  doi: 10.1111/j.1752-1688.2007.00097.x Available Online

Carlisle, Daren M., Falcone, James, and Meador, Michael R., 2008, Predicting the biological condition of streams: use of geospatial indicators of natural and anthropogenic characteristics of watersheds: Environmental Monitoring and Assessment, 0167-6369 (Print) 1573-2959 (Online) May 21, 2008, p. 143-160.  doi: 10.1007/s10661-008-0256-z Available Online

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