Opera is My Hobby - The Career and Art of the American Mezzo-Soprano Sarah Graham; The Use of Poison in Verdi's Operas; In Memoriam: Astrid Varnay, 2006, Box: 13, Folder: 21. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163741 Accessed May 16, 2024.