Maintenance manual, Jeffrey 70-UR Universal Coal Cutter, undated, Box: 3, Folder: 4. Thurman I. Miller Papers, A&M 4297. West Virginia and Regional History Center.
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Maintenance manual, Jeffrey 70-UR Universal Coal Cutter, undated, Box: 3, Folder: 4. Thurman I. Miller Papers, A&M 4297. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/140368 Accessed December 28, 2024.