"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMBN-SQP : accessed 8 December 2017), Robert G Penniston, Oakland, Belknap Township, Pottawattamie, Iowa, United States; citing enumeration district (ED) 78-1, sheet 16A, line 30, family 245, 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 1198.
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