Mitchell Library. MS A173. Folder 3. Gilbert Gould letters, 1839-1842. 17 letters, Box: 14, Folder: 14. 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/205786 Accessed January 13, 2025.