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2by Drost, B. W.“...U.S. Geological Survey,...”
Published 1983
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7by Drost, B. W.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1993
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8by Drost, B. W.“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 1997
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9Published 1998“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
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10by Konrad, Christopher P. (Christopher Peter)“...U.S. Dept. of the Interior, U.S. Geological Survey ;...”
Published 2003
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11by Drost, B. W.“...U.S. Dept. of the Interior, Geological Survey ;...”
Published 1986
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12by Drost, B. W.“...Dept. of the Interior, U.S. Geological Survey ;...”
Published 1990
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13Published 1989“...U.S. Geological Survey ; Books and Open-File Reports,...”
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