1972. 2012-03-15T14:25:50Z. 2012-03-27T23:59:24Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky and Muhlenberg County.
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1971. 2012-03-13T14:03:11Z. 2012-03-27T23:58:50Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky and Muhlenberg County.
1977. 2014-01-17T20:24:12Z. 2014-01-31T23:13:18Z. Smith, Avery E. The Survey. English. Public. Kentucky, McLean County, Hopkins County, Muhlenberg County, and U.S.