↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M815-Q8Z : accessed 13 January 2018), Ernest W Marks in household of Lewis M Marks, Maple, Monona, Iowa, United States; citing ED 88, sheet 5A, line 46, family 87, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 503; FHL microfilm 1,820,503.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7WV-P9W : accessed 13 January 2018), Ernest Mark in household of Lewis M Mark, Niwot, Boulder, Colorado, United States; citing enumeration district (ED) ED 25, sheet 2A, line 36, family 33, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 230; FHL microfilm 2,339,965.
↑ "United States, Obituaries, American Historical Society of Germans from Russia, 1899-2012," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVS9-JJWQ : 1 July 2016), Ernest W Mark, 18 Jun 1996; citing Obituary, in "Coloradoan"; American Historical Society of Germans from Russia, Lincoln.
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