Notes on the Osteology and Relationship of the Fossil Birds of the Genera Hesperornis Hargeria Baptornis and Diatryma, 1903, Box: 33, Folder: 56. J. Harlan Johnson papers, RH MS 735. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/54006 Accessed June 26, 2024.