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

Pixie A. Hamilton, Robert J. Shedlock(United States Geological Survey), Judith M. Denver(Unknown), Patrick J. Phillips
Antarctica A Keystone in a Changing World
January 1, 1993
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