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1969. 2012-02-28T16:37:33Z. 2012-02-28T16:37:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Kentucky, Muhlenberg County, and Ohio County.
3. Geologic map of the Cromwell quadrangle, Butler and Ohio Counties, Kentucky [cartographic material]
1975. 2012-05-01T18:36:41Z. 2018-02-14T14:16:11Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Butler County, and Ohio County.
4. Geologic map of the Flener quadrangle, Butler and Ohio Counties, Kentucky [cartographic material]
1972. 2012-03-29T19:56:54Z. 2018-02-14T14:16:21Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Butler County, and Ohio County.
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.
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.
1972. 2012-03-23T15:13:49Z. 2012-05-03T15:31:43Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, McLean County, and Ohio County.