Correspondence between Izzard, R. J. and Peter Ashlock, 1957, 1959-1961, 1963, Box: 4, Folder: 27. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/395088 Accessed May 10, 2024.