(29) Imp. Folio Supplement - Trochilidae [Supplement to "The Monograph of the Trochilidae or Humming-Birds"], Box: 17, Folder: 9. 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/205896 Accessed December 30, 2024.