↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLR3-BC2 : accessed 29 April 2016), Helen Vandemark in household of Fred Vandemark, Clinton, Lenawee, Michigan, United States; citing enumeration district (ED) ED 58, sheet 3A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,673.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8QM-T68 : accessed 29 April 2016), Helen Vandemark in household of Fred Vandemark, Malta, Phillips, Montana, United States; citing sheet 6A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,974.
↑ "United States Census, 1930", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQBY-NJJ : accessed 29 April 2016), Helen A Van De Mark in entry for Fred G Van De Mark, 1930.
↑ "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4G7-9Z7 : accessed 29 April 2016), Helen Vandemark in household of Fred Vandemark, Clinton Village, Clinton Township, Lenawee, Michigan, United States; citing enumeration district (ED) 46-20, sheet 5B, family 117, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1778.
↑ "Wisconsin, County Marriages, 1836-1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XRLP-1CM : accessed 24 April 2016), Fred G. Van De Mark and Helen A. Benson, 30 Jun 1903; citing , Maiden Rock, Wisconsin, United States, Wisconsin Historical Society, Madison; FHL microfilm 1,275,493.
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