"Twinning, Sex Ratios, and Genetic Variability in Birth Weight in Sheep" by Chapman, A.B. and Lush, J.L, 1932

"Twinning, Sex Ratios, and Genetic Variability in Birth Weight in Sheep" by Chapman, A.B. and Lush, J.L, 1932, Box: 4, Folder: 3. 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/261339 Accessed December 24, 2025.