"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V1SM-JLT : accessed 16 April 2015), Leo M Illies, Township 120 Range 74, Potter, South Dakota, United States; citing enumeration district (ED) 54-26, sheet 1B, family 14, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3866.
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