"South Dakota State Census, 1935," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV4L-CF1 : 29 July 2017), Leo Ladusaw, Brookings ward 4, Brookings, South Dakota; citing p. 837, State Historical Society, Pierre; FHL microfilm 2,369,973.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V19Z-9P4 : 27 July 2019), Bertha Laddusaw in household of Leo Laddusaw, Ward 4, Brookings, Brookings City, Brookings, South Dakota, United States; citing enumeration district (ED) 6-10, sheet 81A, line 10, family , 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 3848.
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