To J. Clark and Henrietta (Sheppard) Cox, 1945-1946, 1949, 1955, 1965, 1971, 1980, 1982-1983, 1989, Box: 11, Folder: 18. Cooper-Sheppard-Cox family papers, RH MS 576. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/159290 Accessed May 20, 2024.