Opera is My Hobby - Rita Streich (series VII, n. 58); Kerstin Thorborg (series VII, n. 59); Schlusnus (series VII, n. 60), Box: 10, Folder: 41. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163557 Accessed June 25, 2025.