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by Peter B. McMahon
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Ground-water flow, geochemistry, and effects of agricultural practices on nitrogen transport at study sites in the Piedmont and Coastal Plain physiographic provinces, Patuxent River Basin, Maryland
E. Randolph McFarland
Nitrate occurrence in U.S. waters (and related questions)
John Fedkiw
Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma
Jerri V. Davis
Nitrates in groundwater
Larry W. Canter
Selected ground-water-quality data for the water-resources investigation of Mellette and Todd Counties, South Dakota, 1990-96
Janet M. Carter
Nitrate and other water-quality characteristics, and nitrogen in the unsaturated zone, in the Red Willow and Hitchcock Counties Special Protection Area, southwest Nebraska, 1993-95
G. V. Steele
Ionic composition and nitrate in drainage water from fields fertilized with different nitrogen sources, Middle Swamp watershed, North Carolina, August 2000-August 2001
Stephen L. Harden
Ground-water-quality-monitoring program in Iowa
Mark G. Detroy
Predicting ground-water vulnerability to nitrate in the Puget Sound Basin
M. L. Erwin
