C.H. Martin, Jr, C.H. Martin, Sr, Hal Gerlach, F.P. Martin, Virgil Grant, R.J. Loskill, J.J. Valentine, M.H. Morsbach, and others, Box: 4, Folder: 55. Martin Tractor Company records, RH MS 864. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/154359 Accessed January 03, 2025.