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1by Willard, Debra A.“...U.S. Geological Survey,...”
Published 1997
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6by Reich, Christopher D.“...U.S. Geological Survey,...”
Published 2009
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7by Fischer, John N.“...U.S. Geological Survey,...”
Published 1980
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8by Sonenshein, R. S.“...U.S. Geological Survey,...”
Published 1992
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Government Document eBook -
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11by Waller, Bradley G.“...U.S. Geological Survey,...”
Published 1985
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12by Sonntag, W. H.“...U.S. Geological Survey,...”
Published 1987
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13by La Rose, Henry R.“...U.S. Geological Survey,...”
Published 1990
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14by Marella, Richard L.“...U.S. Geological Survey,...”
Published 1992
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16by Boggess, Durward H.“...U.S. Geological Survey,...”
Published 1986
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17
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18by Swain, Eric D.“...U.S. Geological Survey,...”
Published 1997
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19by Swain, Eric D.“...U.S. Geological Survey,...”
Published 1992
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