"The Hardrock Miners: A History of the Mining Labor Movement in the American West, 1863-1893" by Richard E. Lingenfelter, 1974

"The Hardrock Miners: A History of the Mining Labor Movement in the American West, 1863-1893" by Richard E. Lingenfelter, 1974, Box: 61, Folder: 8. J. Davitt McAteer Papers regarding Mining Safety, A&M 4219. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/112384 Accessed March 20, 2026.