"Texas Death Index, 1903-2000," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VZV4-YKH : 24 May 2014), George Vernon Alvis, 13 Aug 1999; from "Texas, Death Index, 1903-2000," database, Ancestry (http://www.ancestry.com : 2006); citing certificate number , Rockwall, Texas, Texas Department of Health, State Vital Statistics Unit, Austin.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V9JJ-B4S : 10 January 2021), George V Alvis, 13 Aug 1999; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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