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1by Condon, Steven M.“...U.S. Geological Survey ;...”
Published 2005
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2by Sweeney, Ronald E.“...U.S. Geological Survey,...”
Published 2005
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3Published 1988“...U.S. Geological Survey,...”
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4by Scott, Glenn R., 1918-2012“...U.S. Geological Survey,...”
Published 1978
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