| Notes |
- "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWBJ-Z8X : accessed 17 August 2020), Erna Rosentreter in household of Emil Rosentreter, Dora, Otter Tail, Minnesota, United States; citing ED 132, sheet 2A, line 19, family 24, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 847; FHL microfilm 1,820,847.
- "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X38K-X5Q : accessed 17 August 2020), Erna E Rosentreter in household of Emeil Rosentreter, Dora, Otter Tail, Minnesota, United States; citing enumeration district (ED) ED 22, sheet 2A, line 18, family 30, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1111; FHL microfilm 2,340,846.
- "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSVT-LJS : 25 January 2020), Erma C Rosentrater in household of Amel Rosentrater, Dora Township, Otter Tail, Minnesota, United States; citing enumeration district (ED) 56-22, sheet 6B, line 66, family 120, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1945.
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