"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2016," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKDD-HQ81 : 11 February 2018), Otto Mayer, 24 Apr 1905; citing Birth, Mcpherson, South Dakota, United States, South Dakota Department of Health, Pierre.
"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MPX1-KBY : accessed 1 January 2021), Otto Mayer in household of Jacob Mayer, Blaine Township, McPherson, South Dakota, United States; citing enumeration district (ED) ED 294, sheet 4B, family 47, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1483; FHL microfilm 1,375,496.
"South Dakota, School Records, 1879-1970," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QK73-DJWF : accessed 1 January 2021), Otto Mayer, 1918; citing School enrollment, Hosmer, McPherson, South Dakota, United States, State Historical Society, Pierre; FHL microfilm .
"South Dakota, School Records, 1879-1970," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QK73-DKYG : accessed 1 January 2021), Otto Mayer, 1920; citing School enrollment, Hosmer, McPherson, South Dakota, United States, State Historical Society, Pierre; FHL microfilm .
"South Dakota, School Records, 1879-1970," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QK73-DRL9 : accessed 1 January 2021), Otto Mayer, 1921; citing School enrollment, Hosmer, McPherson, South Dakota, United States, State Historical Society, Pierre; FHL microfilm .
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JL5X-RWY : 20 May 2014), Otto Mayer, Mar 1981; 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:QVS3-3NY8 : 11 September 2020), Otto Mayer, 16 Mar 1981; citing Obituary, in "North West Blade"; American Historical Society of Germans from Russia, Lincoln, Nebraska.
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DNA Connections
It may be possible to confirm family relationships with Otto 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 Otto: