Entered from booking ledger and New York Times concert listing and review. "Who Makes Music and Where: OPERA METROPOLITAN OTHER EVENTS." New York Times (1923-), Mar 19 1967, p. 1. ProQuest. Web. 1 Oct. 2024. "Hartwell Mace, Baritone, at Carnegie Recital Hall." New York Times (1923-), Mar 20 1967, p. 25. ProQuest. Web. 1 Oct. 2024.