Core Supplement, Grant Award, Butterfield, 3 PO1 HD02528-0651, 1972, Box: 19, Folder: 4. 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/452767 Accessed July 11, 2025.