1974. 2012-04-24T18:36:44Z. 2021-05-04T23:24:42Z. Hansen, Dan E. U.S. Geological Survey. English. Public. Kentucky, Muhlenberg County, Ohio County, and Butler County.
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1974. 2012-04-24T19:57:38Z. 2012-04-24T19:57:38Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Butler County, and Ohio County.