"Find A Grave Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QPHV-ZRTN : 5 August 2020), Leo Albert Heisel, ; Burial, Allison Park, Allegheny, Pennsylvania, United States of America, Allegheny County Memorial Park; citing record ID 187950293, Find a Grave, http://www.findagrave.com.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VMRB-X2C : accessed 11 May 2016), Leo Heisel, Nov 1986; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
1950 Census, Leo Heisel and Laura Heisel.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KQ89-27J : accessed 11 May 2016), Leo A Heisel, Ross Township, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 2-477A, sheet 3A, family 50, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 3416.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFRQ-X87 : accessed 11 May 2016), Leo A Heisel in household of Jacob A Heisel, Shaler, Allegheny, Pennsylvania, United States; citing sheet 3A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,528.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MGSY-DY5 : accessed 11 May 2016), Leo A Heisel in household of Jacob A Heisel, Hampton, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 83, sheet 8B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,307.
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