1960, 1971, 1974, 1980-1981, 1983-1989, 1992-1994, 1998, Box: 17. 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/204033 Accessed July 26, 2024.