Correspondence between Pea, Luis E. and Peter Ashlock, 1954-1956, 1958, 1960-1962, Box: 4, Folder: 86. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/395147 Accessed May 10, 2024.