1956. 2018-05-24T18:34:40Z. 2018-09-05T19:35:10Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.
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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.
1962. 2018-04-18T19:37:50Z. 2018-09-05T19:43:34Z. Cate, Addison S. Pennsylvania Bureau of Topographic and Geologic Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1946. 2018-01-23T14:42:00Z. 2018-01-23T14:42:00Z. De Witt, Wallace, Jr., 1920-2012. U.S. Geological Survey. English. cartographic image. Public. Pennsylvania, Ohio, Ohio., and Pennsylvania. Mississippian and From 310 to 345 million years ago.
1841. 2008-08-01T18:50:08Z. 2018-10-03T21:33:44Z. Young, J. H. (James Hamilton), cartographer. Published by S. Augustus Mitchell,Sold by Thomas, Cowperthwait & Co., No. 253 Market Street. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1834. 2008-08-01T18:44:44Z. 2018-10-03T21:32:44Z. Young, J. H. (James Hamilton), cartographer. Published by S. Augustus Mitchell. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1832. 2008-06-24T20:30:08Z. 2018-10-03T21:33:01Z. Young, J. H. (James Hamilton), cartographer. Published by S. Augustus Mitchell. English. cartographic image. Public. Pennsylvania and Pennsylvania.
1770. 2008-07-29T19:47:46Z. 2018-09-05T20:03:03Z. Scull, William, active 1765, cartographer. Printed by James Nevil. English. cartographic image. Public. Pennsylvania and Pennsylvania.