Harbor Seal (Phoca vitulina) with Nursing Pup from “A Field Guide to the Whales, Porpoises and Seals of the Gulf of Maine and Eastern Canada” by Steven K. Katona, et al - PC-40, ©1977, Box: 5, Folder: 41, item: 7. 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/310674 Accessed June 15, 2025.