"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFJ5-8YS), GUSTAVUS TONN, Campbellsport, Fond Du Lac, Wisconsin, United States; citing ED 21, sheet 5B, line 52, family 129, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1987; FHL microfilm 1,821,987.
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