(19) Imp. Folio Ramphastidae - Toucans ["A Monograph of the Ramphastidae, or Family of the Toucans"], Ed. 2, 1 vol, 1852 - 1854, Box: 16, Folder: 60. 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/205886 Accessed January 20, 2025.