Opera is My Hobby - Lindsborg Singer (series VII, n. 514); "Die Frau Ohne Schatten" (series VII, n. 516); Great Climaxes in Opera (series VII, n. 517); Nicolai Ghiaurov (series VII, n. 518), Box: 12, Folder: 18. Personal Papers of James E. Seaver, PP 534. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/163663 Accessed May 17, 2024.