Certificate of appreciation from President Richard M. Nixon, 1971[removed from RH MS 760: miscellaneous and personal files, 1912-1998], Box: 2, Folder: 6. Elmer C. Jackson papers, RH MS 410. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/279900 Accessed October 12, 2024.