Three Felines - Leopard (Panthera pardus), Tiger (Panthera tigris), Lion (Panthera leo) - NC-20, ©1991, Box: 5, Folder: 18, item: 1. Natural History Art and Illustration by D. D. Tyler, MS 337. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/310557 Accessed June 14, 2025.