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1977. 2018-05-24T18:48:32Z. 2018-09-05T19:42:10Z. Geological Survey (U.S.). Interior--Geological Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1958. 2018-05-24T18:23:32Z. 2018-09-05T19:38:40Z. Geological Survey (U.S.). Interior--Geological Survey : For sale by the Supt. of Docs., U.S. G.P.O. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1956. 2018-05-24T18:27:24Z. 2018-09-05T19:41:59Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.