Significant Contribution of the 20th Century: In the Field of Mental Retardation/Developmental Disabilities

Significant Contribution of the 20th Century: In the Field of Mental Retardation/Developmental Disabilities, Box: 2, Folder: 124. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/305010 Accessed December 25, 2025.