United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSPB-KTK : accessed 28 June 2020), Ragna Ostraadt in household of Thoralf Ostraadt, Chicago (Districts 1501-1750), Cook, Illinois, United States; citing enumeration district (ED) ED 1501, sheet 19A, line 40, family 312, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 481; FHL microfilm 2,340,216.
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