"Sweden, Household Examination Books, 1880-1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QLP4-GKD7 : 28 August 2019), Olof Magnus in entry for Sven Kjell, from 1880 to 1886; from "Sweden Household Examination Books, 1860-1920," database and images, MyHeritage (https://www.myheritage.com : n.d.); citing from 1880 to 1886, 7068261, AI15, various Lutheran parishes, Sweden.
"Minnesota Deaths, 1887-2001," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:W6RX-JZN2 : 10 September 2019), Olof M Kjell, 24 Oct 1910; citing Death, Minnesota State Department of Health, St. Paul.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M934-BVL : accessed 2 April 2022), Olaf Kjell in household of Swen Kjell, Fergus Falls city Ward 2, Otter Tail, Minnesota, United States; citing enumeration district (ED) 168, sheet 9B, family 189, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,779.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2PM-Z4Z : accessed 2 April 2022), Olaf Kjell, Fergus Falls Ward 1, Otter Tail, Minnesota, United States; citing enumeration district (ED) ED 154, sheet 5B, family 98, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 714; FHL microfilm 1,374,727.
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