First day of Issued Stamps, including: Dwight D. Eisenhower, Harry Truman, and Thomas Hart Benton, 1963 - 1990, Box: 10, Folder: 14-15. Papers of Harry Darby, RH MS 1345. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/166816 Accessed May 27, 2024.