"The Sperm Production of Adult Rams in Relation to Frequency of Semen Collection" by Chang, M.C, 1945, Box: 4, Folder: 2. Personal papers of John "Jack" A. Weir, PP 404. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/261338 Accessed May 15, 2024.