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2by Femmer, Suzanne R.“...U.S. Geological Survey ;...”
Published 1997
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4by Brown, Larry R.“...U.S. Geological Survey,...”
Published 1998
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5Published 1990“...U.S. Geological Survey ;...”
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6by Colman, John A.“...U.S. Geological Survey ;...”
Published 1991
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7by Jordan, Paul Robert, 1933-“...U.S. Geological Survey ;...”
Published 1991
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8Published 1995“...U.S. Geological Survey ;...”
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12by Koterba, Michael T.“...U.S. Geological Survey ;...”
Published 1995
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13
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14by Carter, Donna S., 1963-“...U.S. Geological Survey ;...”
Published 1995
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16by Harris, Sandra L.“...U.S. Geological Survey ;...”
Published 1997
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17by Nolan, Bernard T., 1954-“...U.S. Geological Survey,...”
Published 1997
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18by Zelt, Ronald B.“...U.S. Geological Survey ;...”
Published 1996
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