"Supplemental Agreement, Public Service Company of Northern Illinois, Peabody Coal Company." [n.p.] 54 p., 1934

"Supplemental Agreement, Public Service Company of Northern Illinois, Peabody Coal Company." [n.p.] 54 p., 1934, Box: 1, Folder: 3. Labor History Collection of Publications and Artifacts, A&M 0162. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/158725 Accessed October 26, 2024.