"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS7V-TWQ : accessed 27 January 2017), Mamie Clancy in household of John Clancy, Worth Township Blue Island village, Cook, Illinois, United States; citing enumeration district (ED) 1196, sheet 40B, family 698, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,295.
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