"United States Census, 1910", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2B4-J5X : accessed 19 October 2015), George Blackburn in entry for Ben Blackburn, 1910.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8C7-DRH : accessed 19 October 2015), George Blackburn in household of Benjiman Blackburn, Hannibal Ward 4, Marion, Missouri, United States; citing sheet 15B, family 346, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,934.
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