Program Project, Site Visits, Preview on NICHD Program Project, Seymour Rosenberg and Jerry Siegel, Visitors, February 19, 1970, Box: 62, Folder: 3. 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/455424 Accessed June 02, 2024.