Certificates, 1968, 1970, 1972, 1975-1976, 1986, 1990-1991, 1993-1994, Box: 6, Folder: 27. Robert C. Caldwell family papers, RH MS 627. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/272768 Accessed November 23, 2024.