Correspondence file, [P, Q], Horace H. "Hod" Rich, Maud Powell program, 1918, 1921, Box: 18, Folder: 51. Herd family papers, RH MS 1374. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/211539 Accessed June 07, 2023.