"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWNV-MH2 : 10 January 2021), Adren Heisler in household of Gus Heisler, Commissioner's Precinct 2, Bandera, Texas, United States; citing enumeration district (ED) 10-3, sheet 6A, line 22, family 116, 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 3980.
"United States, GenealogyBank Obituaries, Births, and Marriages 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKKB-3CR6 : accessed 1 October 2022), Gus Heisler in entry for Adren R Heisler, Texas, United States, 26 Feb 2007; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing San Antonio Express-News, born-digital text.
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