First day of Issued Dwight D. Eisenhower Stamp and Envelope: In Memorandum, September 14, 1964, Box: 10, Folder: 13. Papers of Harry Darby, RH MS 1345. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/166815 Accessed November 15, 2024.