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1Published 1983“...U.S. Geological Survey,...”
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2Published 1986“...U.S. Geological Survey,...”
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3Published 1985“...U.S. Geological Survey :...”
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4Published 1985“...U.S. Geological Survey :...”
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5Published 1989“...U.S. Geological Survey :...”
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6Published 1989“...U.S. Geological Survey :...”
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7Published 1989“...U.S. Geological Survey :...”
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8Published 1991“...U.S. Geological Survey :...”
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9Published 1991“...U.S. Geological Survey :...”
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10Published 1991“...U.S. Geological Survey ;...”
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11Published 1991“...U.S. Geological Survey :...”
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12by Schaefer, Donald H.“...U.S. Geological Survey ;...”
Published 1991
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13Published 1991“...U.S. Geological Survey ;...”
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14by Peltz, Lorri A. (Lorri Ann), 1959-“...U.S. Geological Survey ;...”
Published 1991
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15Published 1991“...U.S. Geological Survey :...”
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16by Spangler, Lawrence E.“...U.S. Geological Survey ;...”
Published 1992
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17by Roark, D. Michael“...U.S. Geological Survey ;...”
Published 1992
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18Published 1991“...U.S. Geological Survey :...”
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19Published 1991“...U.S. Geological Survey :...”
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20Published 1995“...U.S. Geological Survey ;...”
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