Federal Board for Vocational Education -- Technical Information Booklets on Coal Mining, 1931, 1935, Box: 3. J.J. Rutledge Technical Writings on Coal Mining, A&M 3312. West Virginia and Regional History Center.
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Federal Board for Vocational Education -- Technical Information Booklets on Coal Mining, 1931, 1935, 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/164335 Accessed February 03, 2026.