1971. 2012-03-14T14:21:46Z. 2012-03-27T23:59:11Z. Johnson, William D., Jr. U.S. Geological Survey. English. Public. Kentucky and Ohio County.
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1971. 2012-03-14T17:13:34Z. 2012-03-27T23:59:14Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Kentucky, Ohio County, and Grayson County.