"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMRT-JJC : 14 March 2018), Francis W Gavin, Hanover Township, Allamakee, Iowa, United States; citing enumeration district (ED) 3-5, sheet 4B, line 43, family 66, 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 1136.
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