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1Published 1981“...U.S. Geological Survey,...”
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3by Nystrom, Elizabeth A.“...U.S. Geological Survey,...”
Published 2006
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4by Nystrom, Elizabeth A.“...U.S. Geological Survey,...”
Published 2007
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5by Eckhardt, David A.“...U.S. Geological Survey,...”
Published 2007
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6by Nystrom, Elizabeth A.“...U.S. Geological Survey,...”
Published 2007
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7by Reynolds, Richard J.“...U.S. Geological Survey,...”
Published 2007
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12by Bergeron, Marcel P.“...U.S. Geological Survey,...”
Published 1987
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13by Soren, Julian“...U.S. Geological Survey,...”
Published 1976
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17by Barnes, Charles R.“...U.S. Geological Survey,...”
Published 1986
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