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Shedlock, Robert J., Denver, Judith M., Hayes, Martha A., Hamilton, Pixie A., Koterba, Michael T., Bachman, L. Joseph, Phillips, Patrick J., and Banks, William S.L., 1999, Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia: Results of investigations, 1987-91: U.S. Geological Survey Water-Supply Paper 2355-A, 41 p.  Available Online

Hamilton, P.A., Denver, J.M., Phillips, P.J., and Shedlock, R.J., 1993, Water-quality assessment of the Delmarva Peninsula, Delaware, Maryland, and Virginia--Effects of agricultural activities on, and distribution of, nitrate and other inorganic constituents in the surficial aquifer: U.S. Geological Survey Open-File Report 93-40, 87 p.  Available Online

Denver, J.M., Ator, S.W., Debrewer, L.M., Ferrari, M.J., Barbaro, J.R., Hancock, T.C., Brayton, M.J., and Nardi, M.R., 2004, Water quality in the Delmarva Peninsula, Delaware, Maryland, and Virginia, 1999-2001: U.S. Geological Survey Circular 1228, 30 p.  Available Online

Fischer, J.M., Riva-Murray, Karen, Hickman, R.E., Chichester, D.C., Brightbill, R.A., Romanok, R.M., and Bilger, M.D., 2004, Water quality in the Delaware River Basin, Pennsylvania, New Jersey, New York, and Delaware, 1998-2001: U.S. Geological Survey Circular 1227, 38 p.  Available Online

Denver, J.M., Tesoriero, A.J., and Barbaro, J.R., 2009, Trends and transformation of nutrients and pesticides in a Coastal Plain Aquifer System, United States: Journal of Environmental Quality 2009 39, p. 154-167.  doi: 10.2134/jeq2009.0107 Available Online

Bachman, L.J., Zynjuk, L.D., and Phillips, P.J., 1992, The significance of hydrologic landscapes in estimating nitrogen loads in base flow to estuarine tributaries of Chesapeake Bay: EOS, Transactions, American Geophysical Union, vol. 73, no. 14, Spring Meeting Supplement, p. 113. 

Frankforter, Jill D., Weyers, Holly S., Bales, Jerad D., Moran, Patrick W., and Calhoun, Daniel L., 2009, The relative influence of nutrients and habitat on stream metabolism in agricultural streams: Environmental Monitoring and Assessment, August 15, 2009, 19 p.  doi: 10.1007/s10661-009-1127-y Available Online

Denver, J.M., Ator, S.W., Fischer, J.M., Harned, D.C., Schubert, Christopher, and Szabo, Zoltan, 2014, The quality of our Nation's waters-Water quality in the Northern Atlantic Coastal Plain surficial aquifer system, Delaware, Maryland, New Jersey, New York, North Carolina, and Virginia, 1988-2009: U.S. Geological Survey Circular 1353, 88 p.  http://dx.doi.org/10.3133/cir1353 Available Online

Munn, M., Frey, J., and Tesoriero, A., 2010, The influence of nutrients and physical habitat in regulating algal biomass in agricultural streams: Environmental Management, web only, February 2010.  doi: 10.1007/s00267-010-9435-0 Available Online

Shedlock, R.J., 1993, The Delmarva study: Geotimes, December 1993 vol. 38, no. 12, p. 12-14. 

Murdoch, Peter S., Jenkins, Jennifer C., and Birdsey, Richard A., eds., 2008, The Delaware River Basin Collaborative Environmental Monitoring and Research Initiative: Foundation Document: Gen. Tech. Rep. NRS-25 (U.S. Department of Agriculture, Forest Service, Northern Research Station, Newtown Square, PA), 93 p.  Available Online

Debrewer, Linda M., Ator, Scott W., and Denver, Judith M., 2008, Temporal trends in nitrate and selected pesticides in Mid-Atlantic ground water: Journal of Environmental Quality, vol. 37, no. 5, p. S296-S308.  doi: 10.2134/jeq2007.0664 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

Moore, R.B., Johnston, C.M., Smith, R.A., and Milstead, B., 2011, Source and delivery of nutrients to receiving waters in the Northeastern and Mid-Atlantic regions of the United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p.  doi: 10.1111/j.1752-1688.2011.00582.x Available Online

Hoos, A.B., Moore, R.B., Garcia, A.M., Noe, G.B., Terziotti, S.E., Johnston, C.M., and Dennis, R.L., 2013, Simulating stream transport of nutrients in the eastern United States, 2002, using a spatially-referenced regression model and 1:100,000-scale hydrography: U.S. Geological Survey Scientific Investigations Report 2013-5102, 33 p.  Available Online

Fisher, Gary T., 1995, Selected herbicides in major streams in the Potomac River Basin upstream from Washington, D.C.: U.S. Geological Survey Fact Sheet 107-95, 4 p.  Available Online

Johnson, M.R., Buell, G.R., Kim, M.H., and Nardi, M.R., 2007, Riparian land use/land cover data for five study units in the Nutrient Enrichment Effects Topical study of the National Water-Quality Assessment Program: U.S. Geological Survey Data Series 306, 9 p.  Available Online

Hamilton, P.A., and Shedlock, R.J., 1989, Relations between land use and nitrate concentrations in shallow ground water, Delmarva Peninsula: U.S. Geological Survey Yearbook, Fiscal Year 1989, p. 38-41. 

Meador, Michael R., Brown, Larry R., and Short, Terry, 2003, Relations between introduced fish and environmental conditions at large geographic scales: Ecological Indicators, vol. 3, p. 81-92.  doi: 10.1016/S1470-160X(03)00013-X Available Online

Ator, Scott W., 2000, Relating shallow ground-water quality to surficial hydrogeology in the Mid-Atlantic Coastal Plain: Conference Proceedings- NWQMC National Monitoring Conference 2000, Austin, Texas, p. 409-423. 

Phillips, P.J., 1990, Regional water-quality investigation and the ecology of a rare plant species on the Delmarva Peninsula: U.S. Geological Survey, WRD Ecology Newsletter no. 3, p. 1-2. 

Koterba, M.T., Shedlock, R.J., Bachman, L.J., and Phillips, P.J., 1990, Regional and targeted groundwater quality networks in the Delmarva Peninsula, in groundwater residue sampling design: American Chemical Society, Chapter 6, p. 110-138. 

Koterba, M.T., and Shedlock, R.J., 1991, Regional and targeted ground-water-quality networks in the Delmarva Peninsula, Delaware, Maryland and Virginia: American Chemical Society Symposium Series 465, p. 110-138. 

Potapova, M.G., Charles, D.F., Ponader, K.C., and Winter, D.M., 2004, Quantifying species indicator values for trophic diatom indices: a comparison of approaches: Hydrobiologia, vol. 517, p. 25-41.  doi: 10.1016/j.ecolind.2005.10.001 Available Online

Ferrari, Matthew J., Ator, Scott W., Blomquist, Joel D., and Dysart, Joel E., 1997, Pesticides in surface water of the Mid-Atlantic Region: U.S. Geological Survey Water-Resources Investigations Report 97-4280, 12 p.  Available Online

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