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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 McFarland1995
Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma
Jerri V. Davis1998
Selected ground-water-quality data for the water-resources investigation of Mellette and Todd Counties, South Dakota, 1990-96
Janet M. Carter1997