"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XCHV-41G : accessed 25 April 2021), Charles E Rex in household of Frank C Rex, Ingram, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 639, sheet 5B, line 77, family 118, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1964; FHL microfilm 2,341,698.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KQQ7-C6F : 7 January 2021), Charles Rex in household of Frank C Rex, Ingram, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 2-251, sheet 3A, line 18, family 46, 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 3406.
Find a Grave, database and images (www.findagrave.com/memorial/225231236/charles-e.-rex : accessed 25 April 2021), memorial page for Charles E. Rex (1910–1956), Find a Grave Memorial ID 225231236, citing Union Dale Cemetery, Pittsburgh, Allegheny County, Pennsylvania, USA ; Maintained by Find a Grave (contributor 8) .
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