John Erickson, Clifton C. Otto, and Bill Chesney in the Mapping Room of The Western Insurance Companies, 1936, Box: 1, item: 3. Clifton Crain Otto collection of the Western Insurance Companies records, RH MS 1146. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/90951 Accessed May 10, 2024.