(28) Imp. Folio Pittidae, 1 vol. ["Monograph of the Pittidae"], Box: 17, Folder: 8. 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/205895 Accessed July 26, 2024.