1978. 2012-06-06T20:22:27Z. 2012-06-13T15:04:59Z. Kehn, Thomas M. U.S. Geological Survey. English. Public. Kentucky, Muhlenberg County, Logan County, and Todd County.
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1968. 2012-01-30T20:46:12Z. 2012-03-05T17:37:35Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky and Logan County.
1966. 2011-12-20T19:54:13Z. 2012-03-05T17:26:46Z. Ulrich, George E. U.S. Geological Survey. English. Public. Kentucky, Todd County, and Logan County.
1965. 2011-12-16T16:55:41Z. 2012-03-05T17:25:28Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Logan County, Simpson County, and U.S.
1964. 2011-06-07T20:20:03Z. 2012-02-14T23:37:40Z. Miller, Thomas P., 1938-. U.S. Geological Survey. English. Public. Kentucky, Butler County, Logan County, and Muhlenberg County.
1963. 2011-06-07T18:04:32Z. 2012-02-14T00:29:48Z. Klemic, Harry, 1920-. The Survey. English. Public. Kentucky, Warren County, Logan County, and Simpson County.
1963. 2011-05-18T15:35:50Z. 2012-02-14T00:28:24Z. Miller, Thomas P., 1938-. U.S. Geological Survey. English. Public. Kentucky, Butler County, Warren County, and Logan County.
1982. 2002-06-01T04:00:00Z. 2023-05-05T03:07:25Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. North Dakota, Logan County, and Logan County (N.D.).