Correspondence between Gross, Gordon F. and Peter Ashlock, 1957-1958, 1962, 1964-1965, 1967, 1969, 1985, 1987, Box: 4, Folder: 6. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/395067 Accessed April 27, 2024.