United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KSVF-KN9 : accessed 1 July 2018), Bert Koning, Ward 1, Worthington, Worthington City, Nobles, Minnesota, United States; citing enumeration district (ED) 53-30A, sheet 17B, line 74, family 380, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1942.
