PSHTC, Cotter and Spradlin,, OEG-0-70-1198 (607), Progress Report, Submitted, June 12, 1970, 1970, Box: 62, Folder: 23. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/455444 Accessed June 02, 2024.