Class notes by Augusta Haaslock for Williston's Vertebrate Paleontology of Amphibians and Reptiles course at the University of Chicago, summer of 1907, Box: 1, Folder: 10. Personal papers of Samuel W. Williston, PP 32. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/391944 Accessed May 22, 2024.