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United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ32-M4T : accessed 19 June 2020), Mary O Keefe in household of John O Keefe, Chicago Ward 13, Cook (Chicago), Illinois, United States; citing ED 758, sheet 8A, line 15, family 132, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 322; FHL microfilm 1,820,322.
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United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KW4C-F9Y : 25 May 2020), Mary O'Keefe in household of John O'Keefe, Oak Park, Oak Park Township, Cook, Illinois, United States; citing enumeration district (ED) 16-371, sheet 9A, line 3, family 293, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 785. SINGLE, LIVING WITH HER BROTHER.
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