"John Gould the Bird Man: Correspondence", edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, previously published in Volume 1 or Volume 2, Box: 41, Folder: 1-2. 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/206057 Accessed June 17, 2024.