Bill Martin's speech file [includes Martin Tractor legal documents], 1936-42,1945-47, 1956, 1958-59, 1965, 1970-71, 1973-82, 1984 & 1987, Box: 14, Folder: 11. Martin Tractor Company records, RH MS 864. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/154062 Accessed June 15, 2024.