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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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.
