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1by O'Brien, Grady M.“...U.S. Geological Survey :...”
Published 1995
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2by Moyer, Thomas C.“...U.S. Geological Survey :...”
Published 1996
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3by O'Brien, Grady M.“...U.S. Geological Survey,...”
Published 1998
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4Published 1993“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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5Published 1993“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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6by Rattray, Gordon W.“...U.S. Dept. of the Interior, U.S. Geological Survey :...”
Published 1995
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7by Sikora, Robert F.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1993
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8by O'Brien, Grady M.“...U.S. Dept. of the Interior, U.S. Geological Survey :...”
Published 1997
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9by O'Brien, Grady M.“...U.S. Dept. of the Interior, U.S. Geological Survey :...”
Published 1998
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10
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11“...U.S. Department of the Interior, U.S. Geological Survey,...”
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12by O'Brien, Grady M.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1997
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13by Craig, R. W.“...U.S. Dept. of the Interior, Geological Survey :...”
Published 1983
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14by Maldonado, Florian“...U.S. Dept. of the Interior, Geological Survey :...”
Published 1983
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15Published 1984“...U.S. Dept. of the Interior, Geological Survey ;...”
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16by Carr, Wilfred James, 1926-“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1984
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17Published 1984“...U.S. Dept. of the Interior, Geological Survey,...”
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18by Szabo, B. J.“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1985
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19Published 1988“...U.S. Dept. of the Interior, Geological Survey :...”
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