Language and Mental Retardation by Schiefelbusch, Ross H. Copeland and James O. Smith, 1967

Language and Mental Retardation by Schiefelbusch, Ross H. Copeland and James O. Smith, 1967, Box: 10, item: 1. Personal Papers of Richard Schiefelbusch, PP 458. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/266512 Accessed December 25, 2025.