Entered from booking ledger and New York Times concert listing and review. NEW YORK PREMIERE of Ramiro Cortés' STRING QUARTET NO. 1, "SILVERMINE" "MUSIC NOTES." New York Times (1923-), Sep 13 1962, p. 32. ProQuest. Web. 3 Nov. 2023. Ericson, Raymond. "Silvermine Ensemble Presents Haydn, Cortex, Brahms Quartets." New York Times (1923-), Sep 14 1962, p. 31. ProQuest. Web. 2 Nov. 2023.