↑ "South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2016," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKD8-583W : 2 September 2015), Leonard Mayer, 18 Nov 1910; citing Birth, Mcpherson, South Dakota, United States, South Dakota Department of Health, Pierre.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQV3-24T : accessed 1 January 2021), Leanhart Mayer in household of Jacob Mayer, Hosmer, Edmunds, South Dakota, United States; citing enumeration district (ED) ED 17, sheet 3A, line 36, family 39, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2222; FHL microfilm 2,341,956.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:V19J-J5J : 29 February 2020), Leonard Mayer, Hosmer Township, Edmunds, South Dakota, United States; citing enumeration district (ED) 23-17, sheet 1A, line 17, family 5, 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 3855.
"United States Social Security Death Index," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:JY1F-PNT : 4 December 2020), Leonard Mayer, Apr 1983; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, Obituaries, American Historical Society of Germans from Russia, 1899-2012," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVS3-3N2V : 11 September 2020), Leonard Mayer, 21 Apr 1983; citing Obituary, in "Northwest Blade"; American Historical Society of Germans from Russia, Lincoln, Nebraska.
Find a Grave, database and images, memorial page for Leonard Mayer (18 Nov 1910–21 Apr 1983), Find A Grave: Memorial #220505057, citing Sunset Memorial Gardens, Aberdeen, Brown County, South Dakota, USA ; Maintained by Islandergirl (contributor 48322933) .
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It may be possible to confirm family relationships with Leonard by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Leonard: