"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ33-FYK : accessed 30 December 2017), Martha A Hamilton in household of Thomas D Hamilton, Chicago Ward 4, Cook (Chicago), Illinois, United States; citing ED 218, sheet 14B, line 56, family 282, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 314; FHL microfilm 1,820,314.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSL7-VM7 : accessed 30 December 2017), Anna Hamilton in household of D Thomas Hamilton, Chicago (Districts 0251-0500), Cook, Illinois, United States; citing enumeration district (ED) ED 456, sheet 12A, line 38, family 177, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 434; FHL microfilm 2,340,169.
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