"United States Census, 1940", database with images, FamilySearch (ark:/61903/1:1:K4BK-G8J : Tue Jun 13 23:27:44 UTC 2023), Hillel Sinoway in household of Boris I Sinoway and Bessie Sinoway, 1940.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JBTG-D3B : 8 January 2021), Hillel Sinoway, 01 Mar 2003; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, Social Security Numerical Identification Files (NUMIDENT), 1936-2007", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:6K9N-MZVQ : 10 February 2023), Hillel Sinoway, . Name and form dates: Application: HILLEL SINOWAY (Jul 1950), Death: HILLEL SINOWAY (01 Mar 2003).
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