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Crone Anthony J
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ElectronicResource GovDoc
Machette, Michael N.
Washington : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : USGS Map Distribution, 1993.
1993
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ElectronicResource GovDoc
Denver, Colo. : U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
2001
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ElectronicResource GovDoc
Harp, Edwin L.
Reston, Va. : U.S. Geological Survey, 2006.
2006
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