1New York Social Security Death Index, SSDI. "CHARLES KOBERSTEIN born on 25 Oct 1905 and died on Feb 1984 with residence of 11421 (Jamaica, Queens, NY) and social security number of 121-07-7841 issued from New York (Before 1951).".
2New York Social Security Death Index.
11910 U.S. Federal Census, New York, 20 Oct 2004, ancestry.com.