Center Training, 5T32HD-07066-04, 2402/1840-4, Mental Retardation and Other Developmental Disabilities, Earl Butterfield, $152,403.00, July 1, 1979-June 30, 1980, Box: 12, Folder: 1. 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/452511 Accessed July 18, 2025.