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Helsel, Dennis R., 1995, Nitrate in the Nation's waters: A summary of recent studies: Water Resources Update, no. 101, Autumn 1995, p. 12-17.
Hitt, K.J., Ruddy, B.C., and Stoner, J.D., 1999, [abstract] Potential Exposure of the Nation's waters to animal manure: Workshop abstracts-Animal feeding operations: Effects on hydrologic resources and the environment, August 30 - September 1, 1999, Ft. Collins, Colorado, U.S. Geological Survey.
Mueller, David K., Ruddy, Barbara C., and Battaglin, William A., 1994, Nitrate and atrazine in surface waters of the Upper-Midwestern United States: An example of regional synthesis, [abs.], in Sorenson, Stephen K., ed., 1994, Proceedings abstracts American Water Resources Association's symposium on the National Water-Quality Assessment Program--November 7-9, 1994, Chicago, Illinois: U.S. Geological Survey Open-File Report 94-397, p. 7.
Puckett, Larry J., 1994, Estimates of Nonpoint- and point source loadings of nutrients in NAWQA basins: What can they tell us? [abs.], in Sorenson, Stephen K., ed., 1994, Proceedings abstracts American Water Resources Association's symposium on the National Water-Quality Assessment Program- -November 7-9, 1994, Chicago, Illinois: U.S. Geological Survey Open-File Report 94-397, p. 6.
Puckett, L.J., 1994, Nonpoint-and point-source contributions of nitrogen and phosphorus in large watersheds, [abs.]: American Geophysical Union 1994 Fall Meeting, December 5-9, 1994, San Francisco, California, p. 228.
Stoner, J.D., and Goolsby, D.A., 1999, [abstract], Stream nutrients findings from national and regional water-quality assessments: U.S. Department of Agriculture Workshop-"Agricultural and Coastal Resources: Issues in Measuring the Economic Dimensions of Problems and Policies," Washington DC, June 3, 1999.
Tornes, L.H., Puckett, L.J., Stoner, J.D., and Brigham, M.E., 1994, The effect of riparian wetlands in reducing nitrate-nitrogen from a sand and gravel aquifer to a stream, [abs.] poster: American Geophysical Union 1994 Fall Meeting, December 5-9, 1994, San Francisco, California, p. 261.
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