Envelope from Fisher, Clem to Dr. Gordon Sauer, postmarked, 1990-10-30, Box: 1, Folder: 16. 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/204132 Accessed May 27, 2024.