↑ New York State Census, 1905, database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKMN-9C7 : 26 November 2014), James H Vandemark, Marbletown, A.D. 02, E.D. 01, Ulster, New York; citing p. 790, line 11, county offices, New York.; FHL microfilm 842,652.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4LR-B9R : accessed 11 August 2019), Ruth Van Demark in household of James H Van Demark, Marbletown, Ulster, New York, United States; citing enumeration district (ED) ED 37, sheet 3B, line 54, family 76, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1655; FHL microfilm 2,341,389.
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"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K31P-N7S : accessed 24 February 2017), James Henry Van Demark, Marbletown Town, Ulster, New York, United States; citing enumeration district (ED) 56-50, sheet 10A, line 30, family 223, 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 2795.
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