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1Published 1985“...U.S. Geological Survey,...”
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2Published 1990“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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3by Gray, Floyd“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1990
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4“...U.S. Department of the Interior, U.S. Geological Survey,...”
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5Published 1987“...Dept. of the Interior, U.S. Geological Survey ;...”
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6Published 1989“...Dept. of the Interior, U.S. Geological Survey ;...”
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7Published 1989“...Dept. of the Interior, U.S. Geological Survey ;...”
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8Published 1988“...U.S. Dept. of the Interior, Geological Survey :...”
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9Published 1990“...Dept. of the Interior, U.S. Geological Survey ;...”
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10by Gray, Floyd“...Department of the Interior, U.S. Geological Survey,...”
Published 1990
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11by Gray, Floyd“...Department of the Interior, U.S. Geological Survey,...”
Published 1989
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12by Gray, Floyd“...Department of the Interior, U.S. Geological Survey,...”
Published 1989
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13by Gray, Floyd“...U.S. Department of the Interior, Geological Survey,...”
Published 1992
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14by Gray, Floyd“...Department of the Interior, U.S. Geological Survey, 1987...”
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15Published 1992“...U.S. Dept. of the Interior, U.S. Geological Survey ; Books and Open-File Report Sales,...”
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