Graphs and figures depicting variations in world temperature in relation to seasonal birth rates and defects [copies from a book], 1860-1940, Box: 1 (oversize), Folder: 4. Personal Papers of Raymond H. Wheeler, PP 217. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/188269 Accessed April 23, 2025.