"Chances of Receiving Selected Amounts of Precipitation In The North Central Region Of The U.S.", by Barger, Shaw, and Dale, Box: 11, Folder: 13. Personal Papers of George F. Jenks, PP 474. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/136291 Accessed May 25, 2024.