(20) Imp. Folio Ramphastidae - Toucans, supplement, 1 vol. ["A Monograph of the Ramphastidae, or Family of the Toucans", supplement], 1855, Box: 16, Folder: 61. 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/205887 Accessed December 30, 2024.