(21) Imp. Folio Trogonidae, Ed. 2 ["A Monograph of the Trogonidae, or Family of Trogans"], Box: 17, Folder: 1. 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/205888 Accessed June 20, 2025.