1981. 2018-05-10T19:26:42Z. 2018-09-05T19:19:07Z. McIntosh, Willard L. Dept. of the Interior, United States Geological Survey. English. cartographic image. Public. Pennsylvania and Pennsylvania.
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1981. 2023-01-06T18:46:22Z. 2023-01-10T22:36:16Z. Geological Survey (U.S.). Dept. of the Interior, United States Geological Survey. English. cartographic image. Public. Virginia and Virginia.