British Museum (Natural History) Library. Catalogue of an Exhibition arranged for the Easter Meeting of the Society for the Bibliography of Natural History, 1983-03-28 - 1983-03-29, Box: 14, Folder: 69-70. 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/205823 Accessed February 17, 2025.