Early Texans DNA Project
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JR1J-8ZV : 15 October 2021), Lida Knapp, Aug 1980; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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Title "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JR1J-8ZV : 15 October 2021), Lida Knapp, Aug 1980; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing). Short Title "United States Social Security Death Index" Source ID S840 Linked to (1) Lida Chambers