Correspondence between Usinger, Robert Leslie and Martha with Peter Ashlock, includes manuscripts, 1953-1959, 1961, 1964-1968, 1972-1973, 1981-1982, Box: 5, Folder: 24-26. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/395194 Accessed April 30, 2024.