Correspondence - Incoming, 1959, 1967-1971, 1973, 1975, 1978-1980, 1987-1988, 1991, 1993-1996, Box: 3, Folder: 7. Papers of Doctor Robert C. Harder, RH MS 607. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/277607 Accessed May 17, 2024.