"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MXVR-SSZ : 12 November 2020), Henry G. Allen, Mason, Illinois, United States; citing enumeration district ED 129, sheet 450A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,235.
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