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1by Ruddy, Barbara C.“...U.S. Geological Survey,...”
Published 1984
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2by Mueller, David K.“...U.S. Geological Survey,...”
Published 1991
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3by Walton-Day, Katherine“...U.S. Geological Survey,...”
Published 2000
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4by Ball, Lyndsay B.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 2015
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Government Document eBook