Center Training, HD-00183-10, "Mental Retardation," Progress Report, Submitted, January 17, 1975, Box: 11, Folder: 30. 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/452498 Accessed May 15, 2025.