1983. 2016-06-21T14:02:17Z. 2016-09-26T17:42:51Z. Duigon, Mark T. State of Md., Dept. of Natural Resources, Md. Geological Survey. English. cartographic image. Public. Pennsylvania, New Freedom Region, Maryland, and Parkton Region.
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2. Pennsylvania
1983. 2002-06-01T04:00:00Z. 2013-07-10T19:36:20Z. United States. Bureau of the Census. Geography Division. U.S. Dept. of Commerce, Bureau of the Census : For sale by the Supt. of Docs., U.S. G.P.O. English. Public. Pennsylvania.
1983. 2018-05-24T18:07:07Z. 2018-09-05T19:40:09Z. Geological Survey (U.S.). Interior-Geological Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.