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1by Roehler, Henry W.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1991
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2by Roehler, Henry W.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1992
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3by Roehler, Henry W.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1993
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4by Roehler, Henry W.“...Department of the Interior, U.S. Geological Survey,...”
Published 1989
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5Published 1987“...Department of the Interior, U.S. Geological Survey,...”
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Government Document eBook