Letter from Gould, John to [Isidore] Geoffroy Saint-Hilaire, 1841-04-11, Box: 61, Folder: 34. 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/206257 Accessed November 28, 2024.