"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZS7-348 : accessed 19 March 2019), Friederika Ruff in household of John P Ruff, Monitor, Bay, Michigan, United States; citing ED 96, sheet 5A, line 19, family 79, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 754; FHL microfilm 1,820,754.
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