Opera is My Hobby - The American Mezzo-Soprano Shirley Verrett (series VII, n. 712); Thomas Hampson sings German Opera Arias (series VII, n. 713); 1921 - 1923 Chicago Opera with Mary Gordon (series VII, n. 714), Box: 12, Folder: 68. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163713 Accessed June 01, 2024.