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"United States Census, 1930", database with images, FamilySearch (ark:/61903/1:1:X7HV-CCF : Tue Apr 04 09:30:07 UTC 2023), Entry for John W Gruenberg and Sarah Gruenberg, 1930.
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"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQLC-TBC : 7 January 2021), John Gruenberg, Dunkirk, Dunkirk, Chautauqua, New York, United States; citing enumeration district (ED) 7-23, sheet 12A, line 5, family 224, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2509.
↑ "United States 1950 Census", database, FamilySearch (ark:/61903/1:1:6XTR-BFHR : Mon May 15 17:22:56 UTC 2023), Entry for John W Gruenberg and Sarah Greenberg, 4 April 1950.
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