Polar Bear Mother and Cubs Swimming from “Bears in the Wild” by Ada and Frank Graham - PC-19, ©1981, Box: 5, Folder: 32, item: 2. 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/310624 Accessed June 17, 2025.