U.S. Geological Survey

Data Series 152

National Water-Quality Assessment Program

Water-Quality, Streamflow, and Ancillary Data for Nutrients in Streams and Rivers Across the Nation, 1992–2001

References Cited

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Mueller, D.K., and Spahr, N.E., 2006, Nutrients in streams and rivers across the Nation—1992–2001: U.S. Geological Survey Scientific Investigations Report 2006-5107, 44 p. Available online at pubs.usgs.gov/sir/2006/5107/.

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Patton, C.J., and Truitt, E.P., 2000, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory—Determination of ammonium plus organic nitrogen by a Kjeldahl digestion method and an automated photometric finish that includes digest cleanup by gas diffusion: U.S. Geological Survey Open-File Report 00–170, 31 p.

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U.S. Geological Survey, 1994, New Preservation Techniques for Nutrient Samples: U.S. Geological Survey, Office of Water Quality Technical Memorandum 94.16, issued August 5, 1994, at URL http://water.usgs.gov/admin/memo/QW/qw94.16.html

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