"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKHV-848 : accessed 4 August 2019), Fred Ahrens in household of Charlie Ahrens, Orland, Cook, Illinois, United States; citing enumeration district (ED) ED 80, sheet 6A, family 78, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 239; FHL microfilm 1,374,252.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJWW-TL1 : accessed 4 August 2019), Fred Ahrens in household of Carl Ahrens, Bremen, Cook, Illinois, United States; citing ED 27, sheet 4A, line 4, family 88, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 359; FHL microfilm 1,820,359.
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