1. Coal-bearing Upper Pennsylvanian and Lower Permian rocks, Washington area, Pennsylvania, Author/Creator: Berryhill, Henry L., Jr. 1921-2013 (Henry Lee) Publication/Creation: Washington : U.S. Govt. Print. Off, 1971 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 619-621. Access & Availability: Loading
2. Coal-bearing Upper Pennsylvanian and Lower Permian rocks, Washington area, Pennsylvania Author/Creator: Berryhill, Henry L., Jr. 1921-2013, (Henry Lee), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1971 Resource Type: Book Access & Availability: Loading