1 copy of "Opera News" (January 9, 1939) containing reproductions of Horner's sketches for the San Francisco production of "Elektra"; two programs for Darius Milhaud's "David", premiering at the Hollywood Bowl, September 22, 1956, of which Horner was the stage director; and press reelease for Metropolitan Opera's 1963-1964 season, for which Horne rrevised and restaged his production of "The Magic Flute".