Entered from booking ledger and New York Times concert listing and review. "CONCERT AND OPERA PROGRAMS FOR THE WEEK." New York Times (1923-Current file), Mar 03 1957, p. 114. ProQuest. Web. 7 Mar. 2019. "DUFFY HAWKINS PLAYS." New York Times (1923-Current file), Mar 09 1957, p. 15. ProQuest. Web. 7 Mar. 2019.