"Fossils, Flora and Fauna in the Coal Measures of the Pottsville Series", 1927

"Fossils, Flora and Fauna in the Coal Measures of the Pottsville Series", 1927, Box: 3. J.J. Rutledge Technical Writings on Coal Mining, A&M 3312. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/164333 Accessed February 03, 2026.