'School Science and Mathematics', 1931-1939 - vol. 31, no. 9; vol. 35, no. 1; vol. 36, no. 9; vol. 39, no. 9, Box: 6, Folder: 9. Personal papers of Ernest Bayles, PP 220. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/273930 Accessed April 29, 2024.