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Resources for the twenty-first century : proceedings of the international centennial symposium of the United States Geological Survey, held at Reston, Virginia, October 14-19, 1979 / F.C. Whitmore, Jr., and M.E. Williams, editors.

Frank C. Whitmore -editor; M. E Williams (Mary Ellen), 1939- -editor; Geological Survey (U.S.), issuing body.

Reston, Va. : U.S. Department of the Interior, U.S. Geological Survey 1982

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