↑ "United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2DM-MFY : accessed 18 July 2020), William Duvall in household of Thomas Duvall, Lexington Ward 5, Fayette, Kentucky, United States; citing enumeration district (ED) ED 32, sheet 12B, family 238, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 474; FHL microfilm 1,374,487.
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHL4-VZL : accessed 18 July 2020), William Prather Duvall in household of Thomas H Duvall, Lexington Ward 5, Fayette, Kentucky, United States; citing ED 70, sheet 15B, line 97, family 376, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 568; FHL microfilm 1,820,568.
↑ "Kentucky, Vital Record Indexes, 1911-1999," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKCM-WBJ1 : 11 February 2018), William P Duvall, 30 Apr 1979; citing Death, Fayette, Kentucky, United States, Kentucky Department for Libraries and Archives, Frankfort.
↑ "United States Social Security Death Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:JPRM-244 : 14 July 2020), William Duvall, Apr 1979; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7RG-PQ1 : 29 May 2020), William Duvall, Ward 6, Lexington, Magisterial District 1, Fayette, Kentucky, United States; citing enumeration district (ED) 34-36, sheet 5B, line 50, family 103, 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 1303.
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