"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MLHR-HKS : accessed 5 August 2022), Clarence Fredricksen in household of Elizabeth Fredricksen, Weston, Oneida, Idaho, United States; citing enumeration district (ED) ED 235, sheet , family , NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll ; FHL microfilm .
"Utah, County Marriages, 1871-1941", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:2:9VH8-8MC : 4 August 2017), Entry for Marcus Clarence Fredricksen and Bertha Annie Neuensuander, 1911.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M8PB-NG8 : accessed 29 June 2020), Clarence Frederickson, Salt Lake City Ward 2, Salt Lake, Utah, United States; citing ED 117, sheet 9B, line 59, family 186, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1866; FHL microfilm 1,821,866.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XH68-MTY : accessed 29 June 2020), Clarence Fredrickson, Precinct 05, Salt Lake, Utah, United States; citing enumeration district (ED) ED 109, sheet 8A, line 30, family 139, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2417; FHL microfilm 2,342,151.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VT4Q-ZLY : 28 February 2020), Clarence Frederickson, Election Precinct 3, Salt Lake, Utah, United States; citing enumeration district (ED) 18-18, sheet 7A, line 18, family 118, 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 4215.
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