"John Gould: The Bird Man, A Chronology and Bibliography" by Gordon C. Sauer [Copy 1?], Box: 4, Folder: 1-3. 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/204159 Accessed May 19, 2024.