Colombo, John, 4401-1, Individual Differences in Early Visual Behavior, MH41395, September 1, 1985-August 31, , 1986, Box: 12, Folder: 24. 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/452534 Accessed May 16, 2025.