Letter from Lyle Kenyon Engel to P. Schuyler Miller, list of books and records, May 13, 1974, Box: 19, Folder: 1109. Papers of P. Schuyler Miller, MS 255. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/250129 Accessed January 19, 2025.