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- Entered from booking ledger, New York Times concert listing and review, and 1/16/1961 Riverside Chamber Singers program. The review seems to indicate that this concert repeated the program from 1/16/1961; no indication could be found that the earlier performance was cancelled or postponed.
"CONCERT AND OPERA PROGRAMS THIS WEEK." New York Times (1923-), Jan 29 1961, p. 1. ProQuest. Web. 12 Sep. 2022.
Ericson, Raymond. "Music: Chamber Singers: Riverside Ensemble Gives A Cappella Program in Carnegie Recital Hall." New York Times (1923-), Feb 03 1961, p. 16. ProQuest. Web. 13 Sep. 2022.
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