↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJPD-DBT : accessed 5 August 2019), Beatrice Van Demark in household of George Van Demark, Bronx Assembly District 7, Bronx, New York, United States; citing ED 381, sheet 4A, line 42, family 68, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1140; FHL microfilm 1,821,140.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X48V-RWK : accessed 5 August 2019), Beatrice Van Demark in household of George Van Demark, Saddle River, Bergen, New Jersey, United States; citing enumeration district (ED) ED 226, sheet 6A, line 41, family 138, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1316; FHL microfilm 2,341,051.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K453-N3J : 29 July 2019), Mable C Ferguson in household of George B Vandemark, Saddle River Township, Bergen, New Jersey, United States; citing enumeration district (ED) 2-325A, sheet 1A, line 27, family 5, 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 2314.
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