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1Published 2008“...U.S. Geological Survey,...”
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2by Wiele, Stephen Mark“...U.S. Dept. of the Interior, U.S. Geological Survey,...”
Published 1998
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3by Webb, Robert H.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1997
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4by Webb, Robert H.“...U.S. Department of the Interior, U.S. Geological Survey,...”
Published 1996
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5“...U.S. Department of the Interior, U.S. Geological Survey,...”
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6