"Minnesota State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ63-GWB : 3 April 2016), Zelma Oldenburg in household of Herman Oldenburg, Beauford, Blue Earth, Minnesota; citing p. 21, line 3, State Library and Records Service, St.Paul; FHL microfilm 565,763.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGJ4-4QJ : accessed 21 November 2018), Selma Oldenburg in household of Ida Oldenburg, Mayview, Garfield, Washington, United States; citing enumeration district (ED) ED 67, sheet 10A, family 114, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1654; FHL microfilm 1,375,667.
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