MoP (Missouri Pacific) 1st gen diesels 6007 - 74-B, 2nd gen diesels 418 - 2322, Box: 8, Box: 60. Howard Killam Collection, RH MS 1381. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/226799 Accessed May 19, 2024.