Bullhead-Lilly (Nuphar variegatum) - Bk-31, ©1984, Box: 5, Folder: 14, item: 4. 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/310537 Accessed June 20, 2025.