↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMNR-H31 : accessed 29 January 2016), C W Vandermark, Louisa District Louisa town, Louisa, Virginia, United States; citing sheet 11B, family 223, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,716.
↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MK6S-S3T : 29 October 2015), Helen Vandermark in household of Charles Vandermark, Waukegan Ward 4, Lake, Illinois, United States; citing enumeration district (ED) ED 117, sheet 13A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,315.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ4R-LVX : accessed 25 March 2017), Walter Van De Mark in household of Henry Jacobs, North Chicago Ward 2, Cook (Chicago), Illinois, United States; citing ED 265, sheet 21A, line 39, family 34, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 381; FHL microfilm 1,820,381.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSTT-M8J : accessed 25 March 2017), Walter J Van De Mark, Maywood, Cook, Illinois, United States; citing enumeration district (ED) ED 2925, sheet 14A, line 12, family 223, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 507; FHL microfilm 2,340,242.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4G9-D8B : accessed 25 March 2017), Walter J Vandemark, Walker Township, Kent, Michigan, United States; citing enumeration district (ED) 41-47A, sheet 8A, line 2, family 156, 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 1776.
↑ "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6D2-T7D : 12 December 2014), Walter Jacob Vandermark, 1917-1918; citing Lake County no 2, Illinois, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,614,033.
↑ "California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VPKB-PR7 : 26 November 2014), Walter J Vandemark, 02 May 1970; Department of Public Health Services, Sacramento.
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