"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8SN-1TC : accessed 3 March 2016), John Gruppenhoff in household of Henry Gruppenhoff, Monterey, Putnam, Ohio, United States; citing enumeration district ED 138, sheet 404A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1060; FHL microfilm 1,255,060.
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