1911. 2013-03-14T18:16:03Z. 2013-03-14T18:16:03Z. Shaw, E. W. (Eugene Wesley), 1881-1935. The Survey. English. Public. Pennsylvania, Armstrong County, Butler County, Clarion County, and Venango County.
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2. 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.
3. 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.
1972. 2012-03-29T14:53:29Z. 2018-02-14T14:16:30Z. Geological Survey (U.S.). The Survey. English. Public. Kentucky, Butler County, and Warren 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.
