. "Zinaida Alvers, Contralto" . "Entered from booking ledger and New York Times concert listing. The accompanist is not identified.\r\n\"CONCERT AND OPERA PROGRAMS FOR THE WEEK: OPERA METROPOLITAN CONCERTS, RECITALS TODAY.\" New York Times (1923-Current file), Nov 25 1956, p. 152. ProQuest. Web. 19 Apr. 2021." . . . . . . . . . . . . . "1956-12-01T17:30:00"^^ . . . .