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1942. 2020-01-08T20:45:46Z. 2021-10-01T21:33:02Z. Shaw, R. S. U.S. Forest Service. English. cartographic image. Public. Allegheny National Forest (Pa.), Pennsylvania, and Allegheny National Forest.
1938. 2011-12-12T21:36:02Z. 2022-03-29T20:40:32Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
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