"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MW1D-9RL : accessed 3 December 2018), Helmer Bjornsti in household of Olaf Matsen, Duluth, St Louis, Minnesota, United States; citing ED 92, sheet 13B, line 100, family 290, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 858; FHL microfilm 1,820,858.
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