↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSWH-7R8 : accessed 18 February 2017), Robt Vandermark in household of Wm Vandermark, Annawan Township Annawan village, Henry, Illinois, United States; citing enumeration district (ED) 3, sheet 2A, family 32, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,305.
↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKXZ-2BW : accessed 18 February 2017), Robert Vandermark in household of William Vandermark, East Moline Ward 2, Rock Island, Illinois, United States; citing enumeration district (ED) ED 130, sheet 14A, family 239, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 320; FHL microfilm 1,374,333.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMRB-Z6J : accessed 18 February 2017), Robert G Vandermark, Douglas Township, Appanoose, Iowa, United States; citing enumeration district (ED) 4-12, sheet 4A, line 1, family 68, 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 1137.
↑ "United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K669-GHM : 12 December 2014), Robert Glenn Vandemark, 1917-1918; citing Rock Island County no 2, Illinois, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,614,578.
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DNA Connections
It may be possible to confirm family relationships with Robert Glenn by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
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