1971. 2012-03-12T13:03:03Z. 2018-02-14T14:17:40Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Grayson County, Edmonson County, and Hart County.
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1965. 2011-12-16T19:54:27Z. 2012-03-05T17:25:32Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Hardin County, Grayson County, Hart County, and U.S.