"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KSJ1-9HT : accessed 29 January 2015), Wilho Elo in household of Emil Elo, Spalding Township, Aitkin, Minnesota, United States; citing enumeration district (ED) 1-39, sheet 2B, family 36, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1903.
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