McMillan, Nora. Swainson [letter at Oxford from William Swainson, a contemporary of Gould's], Box: 6, Folder: 31. 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/204488 Accessed November 24, 2024.