Social Security Death Index; "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V376-JXS : 20 May 2014), Harriet A Sonczalla, Mar 1996; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Some of the vital information was provided by Frank Sonczalla, profile manager interviewed him a few times before he passed away.
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