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1Published 1987“...U.S. Geological Survey ;...”
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2“...U.S. Department of the Interior, U.S. Geological Survey,...”
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3“...U.S. Department of the Interior, U.S. Geological Survey,...”
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4by Plafcan, Maria“...U.S. Dept. of the Interior, Geological Survey ;...”
Published 1985
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5