"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KW4R-45Q : 8 January 2021), Helen I Hall in household of Eugene C Hall, Glen Ellyn, DuPage, Illinois, United States; citing enumeration district (ED) 22-64, sheet 7B, line 48, family 207, 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 798.
Find a Grave, database and images (https://www.findagrave.com/memorial/15014993/helen-smith: accessed 14 January 2023), memorial page for Helen Congdon Hall Smith (1913–1987), Find a Grave Memorial ID 15014993, citing Forest Hill Cemetery, Glen Ellyn, DuPage County, Illinois, USA; Maintained by Scott DuJardin (contributor 47472487).
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