1911. 2013-03-14T18:13:26Z. 2021-09-22T17:59:06Z. Shaw, E. W. (Eugene Wesley), 1881-1935. The Survey. English. Public. Pennsylvania, Allegheny County, Beaver County, and Washington County.
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2. Butler, Penn
1911. 2011-12-12T21:36:05Z. 2022-03-29T20:40:32Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
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.
1911. 2011-12-12T21:36:13Z. 2022-03-29T20:40:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1911. 2011-12-12T21:36:15Z. 2022-03-29T20:40:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1911. 2012-08-07T18:39:50Z. 2013-03-18T22:10:06Z. U.S. Geological Survey. English. Public. Maryland, Carroll County (Md.), Frederick County (Md.), Pennsylvania, and Adams County (Pa.).
1911. 2013-03-21T15:15:30Z. 2018-11-09T22:14:05Z. Pennsylvania. Department of Internal Affairs. The Department. English. Public. Pennsylvania. and Pennsylvania.
1911. 2013-03-14T18:10:52Z. 2013-03-14T18:10:52Z. Munn, M. J. (Malcolm John), 1874-1949. U.S. Geological Survey. English. Public. Pennsylvania, Allegheny County, Beaver County, and Butler County.
1911. 2011-12-12T21:28:51Z. 2022-03-29T20:39:37Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland and Pennsylvania.