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- United States. National Park Service38
- United States. Department of the Interior. Southwestern Pennsylvania Heritage Preservation Commission7
- America's Industrial Heritage Project5
- Yamin, Rebecca, 1942-4
- Brown, Sharon A.3
- Chappell, Gordon S.3
- Marie, Audrey R.3
- Dessauer, Peter F.2
- Fitzsimons, Gray, 1955-2
- Historic American Buildings Survey/Historic American Engineering Record2
- Menz, Katherine2
- Muller, Edward K.2
- Randl, Chad2
- Smith, Helene2
- Swetnam, George2
- United States. Advisory Council on Historic Preservation2
- United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Parks and Recreation2
- United States. General Accounting Office2
- United States. National Park Service. Denver Service Center2
- United States. National Park Service. Geologic Resources Division, issuing body2