Michael Haeffele, Mike Harris, Craig Knight (1997), Earl Gravatt (1994), Aaron Whitaker, Peggy Brown, Kristie Mengel-Colby (1997), Charles Rogers, Otto Rohla, David Roth (2001), Vic Winter, Chris Shenklin (1999), John Koch, Virginia Kinsch, Box: 2, Folder: 62. Martin Tractor Company records, RH MS 864. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/154293 Accessed June 16, 2025.