Keynes, Quentin. Catalogs, Throw-Away #2 [dealer catalogs, newsletters], 1994-11, Box: 101, Folder: 37-39. 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/205466 Accessed June 26, 2024.