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1968. 2012-02-15T18:36:47Z. 2012-03-05T17:41:14Z. Geological Survey (U.S.). U.S Geological Survey. English. Public. Nevada and Lander County.
1977. 2012-06-05T14:26:53Z. 2012-06-13T15:04:19Z. Danilchik, Walter. U.S Geological Survey. English. Public. Kentucky, Breathitt County, Knott County, Magoffin County, and U.S.
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