1885 Census: "Minnesota State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ63-829 : accessed 13 March 2016), Nels Olson in household of John M Olson, St. Johns, Kandiyohi, Minnesota; citing p. 21, line 24, 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-3CT : accessed 27 Jul 2014), Nels 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.
1905 Census: "Minnesota State Census, 1905," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SPSZ-JBV : 15 November 2014), Nils J Olson, Shell Lake township, Becker, Minnesota; citing p. 255, line 49, State Library and Records Service, St.Paul; FHL microfilm 928,767.
1930 Census: "United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XCMV-HPV : accessed 27 Jul 2014), Lenord J Olson, School District 078, Dawson, Montana, United States; citing enumeration district (ED) 0044, sheet 1B, family 11, NARA microfilm publication T626, roll 1254.
1940 Census: "United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBQQ-L99 : accessed 9 October 2016), Leonard Olsen, School District 4 Libby, Lincoln, Montana, United States; citing enumeration district (ED) 27-6, sheet 12A, family 261, 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 2223.
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DNA Connections
It may be possible to confirm family relationships with Nils by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Nils: