Harbor Seal and Pup (Phoca vitulina) from “A Field Guide to the Whales, Porpoises and Seals of the Gulf of Maine and Eastern Canada” by Steven K. Katona, et al - EN-1, ©1977, Box: 5, Folder: 19, 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/310563 Accessed June 24, 2025.