Hollis, John H., Implementation of Research in Psychobiology of Developmental Retardation, Grant Number 0421-6-629-0101, 1971, Box: 43, Folder: 5. 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/454066 Accessed June 26, 2024.