Lingwall, Continuation Grant (Progress Report), 55-P-35075-7-01, Submitted, February 26, 1973, Box: 49, Folder: 32. 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/454298 Accessed July 08, 2025.