Jay Irving's "Pottsy" showing insert of 1903 "Clarence the Cop", newspaper print from New York News, 1967, Box: 1, Folder: E, item: 9. Charles William Kahles letters, cartoons, biographical information, photographs, RH MS 124. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/103148 Accessed May 19, 2024.