"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF56-RL2 : 29 August 2017), Oscar Olson in household of Nels Ahlgren, Osage, Osage, Kansas, United States; citing enumeration district ED 36, sheet 146B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,392.
United States Census, 1910
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