"Texas Birth Certificates, 1903-1935," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X2YF-CGH : 1 March 2021), Gus Heisler in entry for Gus Maron Heisler, 04 Aug 1920; citing Pipe Creek, Bandera, Texas, United States, certificate 39599, Texas Department of Health, Austin; FHL microfilm 4,516,128.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWNV-MHK : 10 January 2021), Gussie Heisler in household of Gus Heisler, Commissioner's Precinct 2, Bandera, Texas, United States; citing enumeration district (ED) 10-3, sheet 6A, line 21, 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.
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