Opera is My Hobby - Christoff (series VI, n. 55); Russian Bassos (series VI, n. 57); Cilea and Refice (series VI, n. 58); Di Stefano (series VI, n. 59); Soubrette (series VI, n. 60), Box: 10, Folder: 14. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163530 Accessed May 16, 2024.