"United States Census, 1940," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K7Y7-RRM : accessed 20 March 2015), Helen Campbell in household of Nannie Campbell, Berea, Magisterial District 6, Madison, Kentucky, United States; citing enumeration district (ED) 76-18, sheet 12A, family 272, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 1337.
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