. . "Judith Keller, Mezzo-Soprano" . . "Entered from booking ledger and New York Times concert listing. The accompanist is not identified.\r\n\"THIS WEEK'S CONCERT AND OPERA PROGRAMS.\" New York Times (1923-), May 12 1963, p. 1. ProQuest. Web. 29 Sep. 2023." . . "solo recital" . "1963-05-13T20:30:00"^^ . . . . . . . .