Entered from booking ledger and New York Times concert listing and review. "Operas and Concerts for the Week." New York Times (1923-Current file), New York, N.Y., 1964. Klein, Howard. "NEW TRIO HEARD AT RECITAL HALL." New York Times (1923-Current file), New York, N.Y., 1964.
Robert Helps, Piano, Isidore Cohen, Violin, and Willie Ruff, Horn