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1
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2by Fischer, Edward E.“...U.S. Geological Survey,...”
Published 1987
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3by Benson, Rick D.“...U.S. Geological Survey,...”
Published 1983
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4
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6by Guenthner, R. Scott“...U.S. Geological Survey,...”
Published 1991
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7
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8by Ruddy, Barbara C.“...U.S. Geological Survey,...”
Published 1984
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9
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10by Mueller, David K.“...U.S. Geological Survey,...”
Published 1991
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11by Owen-Joyce, Sandra J.“...U.S. Geological Survey,...”
Published 1988
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12by Hjalmarson, H. W.“...U.S. Geological Survey,...”
Published 1990
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13
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16by Watts, Kenneth R.“...U.S. Geological Survey,...”
Published 1995
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17by Walton-Day, Katherine“...U.S. Geological Survey,...”
Published 2000
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