1958. 2011-12-12T21:36:15Z. 2022-03-29T20:40:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
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1958. 2011-12-12T21:36:18Z. 2022-03-29T20:40:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
3. Lykens, Penn
1958. 2011-12-12T21:36:22Z. 2022-03-29T20:40:34Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1958. 2011-12-12T21:36:27Z. 2022-03-29T20:40:34Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1958. 2011-12-12T21:36:31Z. 2022-03-29T20:40:35Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. 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.