British Museum (Natural History). General library. Gould correspondence. Notebooks. 1986 work, Box: 15, Folder: 11-12. 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/205829 Accessed December 01, 2024.