"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JKTZ-948 : accessed 2 October 2015), Leon Demars, Dec 1976; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7ZD-M69 : accessed 2 October 2015), Leon De Mars in household of George De Mars, Tupper Lake, Franklin, New York, United States; citing enumeration district (ED) 0002, sheet 5B, family 84, line 86, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1438; FHL microfilm 2,341,173.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ18-C6H : accessed 2 October 2015), Leon Demars, Tupper Lake, Altamont Town, Franklin, New York, United States; citing enumeration district (ED) 17-2, sheet 2B, family 33, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 2534.
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