"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSKJ-HZ4 : accessed 19 May 2015), Cally M Pool, Eureka Township, Dakota, Minnesota, United States; citing enumeration district (ED) 19-6, sheet 3A, family 43, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1917.
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