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1Published 1990“...U.S. Geological Survey ;...”
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2Published 1972“...U.S. Geological Survey,...”
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5Published 1965“...U.S. Geological Survey,...”
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6by Horton, J. Wright“...U.S. Geological Survey,...”
Published 2006
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14by Petersen, James C.“...U.S. Geological Survey,...”
Published 2005
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15by Hudson, Mark R.“...U.S. Geological Survey,...”
Published 2006
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16by Billingsley, George H.“...U.S. Geological Survey,...”
Published 2007
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17by Billingsley, George H.“...U.S. Geological Survey,...”
Published 2003
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