1965. 2011-12-16T20:41:10Z. 2012-03-05T17:25:34Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Knott County, Perry County, and U.S.
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1965. 2011-12-16T20:00:49Z. 2021-10-01T21:32:56Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Perry County, Knott County, and Letcher County.