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- [S2] National Archives and Records Administration, 1910 United States Federal Census, Manhattan Ward 10, Enumeration District 191, New York County, New York, National Archives Microfilm Roll T624_1009; 1910 United States Federal Census [database on-line]., (Lehi, UT, USA: Ancestry.com Operations, Inc., 2006.).
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- [S12] U.S. Department of State, Jacob Gershwine, U.S. Passport Application, 9 Jun 1922, New York, New York, USA.
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