Signed inter-office memo of appreciation to Clifton Otto, Home Office, from Ray B. Duboc, The Western Insurance Companies, March 10, 1939, Box: 1, Folder: 9. 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/90824 Accessed May 11, 2024.