April 1985, April 1986, June 1988, December 1991/January 1992, December 1994/January 1995, Box: 9, Folder: 4. 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/204196 Accessed November 28, 2024.