"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCQT-VR9 : accessed 17 December 2018), Ella Mae Knight in household of J L Knight, Elk, Beckham, Oklahoma, United States; citing enumeration district (ED) ED 11, sheet 1B, line 74, family 13, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1893; FHL microfilm 2,341,627.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBJZ-8B4 : 14 March 2018), Ella Mae Knight in household of William P Madden, Ward 3, Elk City, Elk City, Beckham, Oklahoma, United States; citing enumeration district (ED) 5-9, sheet 11A, line 39, family 256, 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 3276.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V3Z2-7JQ : 20 May 2014), Ella M Walker, 18 Feb 2000; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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