 
| Type | Valeur | 
|---|---|
| Titre | Walter Webb, "United States Social Security Death Index" | 
| Personnes | 
|---|
|  Walter Lorenzo Webb | 
| "United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J58H-56N : 11 January 2021), Walter Webb, Mar 1968; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing). |