Elmer and Supplee Chubb with mother Sarah Lyter Chubb (real photo postcard), October 20, 1910

Elmer and Supplee Chubb with mother Sarah Lyter Chubb (real photo postcard), October 20, 1910, Box: 9, Folder: 48. Martin Tractor Company records, RH MS 864. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/418860 Accessed December 25, 2025.