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1Published 1980“...The Survey,...”
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2Published 1981“...The Survey,...”
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3Published 1988“...The Survey ;...”
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4Published 1986“...The Survey ;...”
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5Published 1986“...The Survey ;...”
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6Published 1987“...The Survey ;...”
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7Published 1987“...The Survey ;...”
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8Published 1990“...The Survey ;...”
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9Published 1995“...The Survey ;...”
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18by Culbertson, William Craven, 1919-“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1981
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19by Roberts, Laura N. Robinson“...U.S. Dept. of the Interior, Geological Survey,...”
Published 1985
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20Published 1994“...The Survey ; U.S. G.P.O.,...”
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