↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDPH-7QY : accessed 24 November 2019), Mary Vandermark in household of Harry T Vandermark, Cincinnati Ward 26, Hamilton, Ohio, United States; citing ED 454, sheet 5B, line 90, family 124, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1395; FHL microfilm 1,821,395.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4WQ-M6W : accessed 24 November 2019), Mary F Vandermark in household of Harry J Vandermark, Cincinnati (Districts 251-291), Hamilton, Ohio, United States; citing enumeration district (ED) ED 281, sheet 20A, line 24, family 437, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1817; FHL microfilm 2,341,551.
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