Social Security Amendments, Public Law 90-248 (January 2, 1968), 1968, Box: 11B, Folder: 22. 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/176014 Accessed June 17, 2024.