↑ "Iowa, County Births, 1880-1935," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XVFL-XY5 : 10 March 2018), Carl Albert Berggren, 09 Jun 1892; citing Sioux City, Page, Iowa, United States; county district courts, Iowa; FHL microfilm 1,451,574.
↑ "Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VTQV-YPB : 11 March 2018), Carl A Berggren in household of Gus Berggren, Sioux, Iowa, United States; citing p. 458, 1895, State Historical Society, Des Moines; FHL microfilm 1,022,182.
↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9LV-9PX : accessed 17 March 2020), Carl A Berggren in household of August Berggren, Buncombe Township Hawarden town (part), Sioux, Iowa, United States; citing enumeration district (ED) 129, sheet 2B, family 53, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,459.
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQVZ-CJT : accessed 17 March 2020), Carl A Berggren, Fairview, Lincoln, South Dakota, United States; citing enumeration district (ED) ED 10, sheet 2A, line 29, family 37, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2226; FHL microfilm 2,341,960.
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