"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X3DB-TTB : accessed 27 February 2015), Levis G Carlstrom, Bayport, Washington, Minnesota, United States; citing enumeration district (ED) 0003, sheet 5B, family 111, line 80, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1134; FHL microfilm 2,340,869.
"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KSL4-F5S : accessed 27 February 2015), Levis G Carlstrom, Ward 7, St. Paul, St. Paul City, Ramsey, Minnesota, United States; citing enumeration district (ED) 90-148, sheet 1A, family 5, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1998.