"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSH1-JL7 : accessed 8 July 2017), William Harbke in household of Charles Harbke, Oakwville Township Addieville & Okawville villages, Washington, Illinois, United States; citing enumeration district (ED) 142, sheet 12A, family 228, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,349.
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