. "solo recital" . "Entered from New York Times concert listing and review.\r\n\"Opera and Concert Programs of the Week.\" New York Times (1923-Current file): 102. Apr 15 1951. ProQuest. Web. 13 Dec. 2013.\r\n\"Hammer, Baritone, in Recital.\" New York Times (1923-Current file): 21. Apr 23 1951. ProQuest. Web. 13 Dec. 2013.\r\nNEW YORK PREMIERE of Felix Van Dyck's DREAMS" . . . . . . "1951-04-21T20:30:00"^^ . . . . . . . . . . . . "Earl Hammer, Baritone" .