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1by Stevens, Michael R.“...U.S. Geological Survey ;...”
Published 1997
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7by Glatfelter, D. R. (Dale R.)“...U.S. Geological Survey ;...”
Published 1984
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9Published 1994“...U.S. Geological Survey ;...”
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11by Wibben, Herman C.“...U.S. Geological Survey,...”
Published 1976
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12by Tilley, Janet S.“...U.S. Geological Survey,...”
Published 2006
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13by Asquith, William H.“...U.S. Geological Survey,...”
Published 2008
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14by Lee, Jonathan K.“...U.S. Geological Survey,...”
Published 1983
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18by Blodgett, J. C.“...U.S. Geological Survey,...”
Published 1986
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20by Bohman, Larry R.“...U.S. Geological Survey,...”
Published 1990
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