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2by Abbott, P. O.“...U.S. Geological Survey,...”
Published 1985
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3by Crouch, Thomas M.“...U.S. Geological Survey,...”
Published 1984
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4by Burns, Alan W.“...U.S. Geological Survey,...”
Published 1989
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5“...U.S. Department of the Interior, U.S. Geological Survey,...”
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6by Sullivan, Joseph R.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1993
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