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1967. 2012-01-20T18:53:49Z. 2012-03-05T17:35:01Z. Schweinfurth, Stanley P. U.S. Geological Survey. English. Public. Pennsylvania, Fayette County, and Washington County.
1967. 2012-01-19T20:12:15Z. 2012-03-05T17:34:46Z. Kent, Bion H. (Bion Huntley), 1925-. Geological Survey. English. Public. Pennsylvania and Washington County.