"John Gould the Bird Man: Correspondence, Volume 2, 1839 through 1841", edited and compiled by Gordon C. Sauer, with the assistance of Ann Datta, Box: 40, Folder: 14-23. 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/206051 Accessed January 20, 2025.