Resources for the twenty-first century : proceedings of the International Centennial Symposium of the United States Geological Survey, held at Reston, Virginia, October l4-19, 1979
"Resources for the twenty-first century : proceedings of the International Centennial Symposium of the United States Geological Survey, held at Reston, Virginia, October l4-19, 1979"@en
International Centennial Symposium of the U.S. Geological Survey (1979 : Reston, Va.)
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