Oletta's name is spelled Letta Jensine Olson in her marriage record.
Sources
1895 Census: "Minnesota State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ63-82M : accessed 13 March 2016), Olethe Olson in household of John M Olson, St. Johns, Kandiyohi, Minnesota; citing p. 21, line 23, State Library and Records Service, St.Paul; FHL microfilm 565,785.
1900 Census: "United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M99R-3CR : accessed 27 Jul 2014), Lottie J Olson in household of John M Olson, Carsonville, Shell Lake & Grand Park Townships, Becker, Minnesota, United States; citing sheet 5B, family 70, NARA microfilm publication T623, FHL microfilm 1240756.
1910 Census: "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLGJ-ML7 : accessed 13 March 2016), Lettie Olson in household of John M Olson, Township 154, McHenry, North Dakota, United States; citing enumeration district (ED) ED 70, sheet 13A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,156.
Marriage: "North Dakota, County Marriages, 1882-1925," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2ZQ-9PBY : 18 March 2018), Sever Carlson and Letta Jensine Olson, 20 Dec 1910; citing McHenry, North Dakota, United States, State Historical Society of North Dakota, Bismarck; FHL microfilm 101,852,718.
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DNA Connections
It may be possible to confirm family relationships with Oletta by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Oletta: