Correspondence between Wygodzinsky, Pedro and Peter Ashlock, 1957-1969, 1971, 1979-1980, Box: 5, Folder: 38. Personal papers of Peter D. Ashlock, PP 515. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/395206 Accessed May 21, 2024.