Photos: Excavators / Trucks / Plows / Ditch Diggers / Motor Graders / Shovels, circa 1979, Box: 4, Folder: 5. Martin Tractor Company records, RH MS 864. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/153861 Accessed January 03, 2025.