United States Department of the Interior Geological Survey, Forest Service Quadrangle Map, Allegheny National Forest, Pennsylvania, Maps, 1989

United States Department of the Interior Geological Survey, Forest Service Quadrangle Map, Allegheny National Forest, Pennsylvania, Maps, 1989, Box: 111, Item: 292. Institute for the History of Technology and Industrial Archaeology Records, A&M 3936. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/156016 Accessed March 13, 2026.