"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:VBK1-SWF : 5 January 2021), Richard L Gagan in household of Louie Gagan, Madison Township, Washington, Oklahoma, United States; citing enumeration district (ED) 74-17, sheet 4A, line 12, family 56, 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 3339.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JBWG-M3R : 11 January 2021), Richard L Gagan, 02 Jul 2004; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKW5-JWCT : accessed 7 October 2021), Richard L Gagan, Oklahoma, United States, 03 Jul 2004; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Tulsa World, born-digital text.
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