Catalogue of the Edward E. Ayer Ornithological Library Part 2, by John Todd Zimmer, 1926, Box: 113, Carton: 2. Sauer's Gouldiana Research about John Gould and other papers, MS 304. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/205612 Accessed June 17, 2024.