↑
"South Dakota, Department of Health, Index to Births 1843-1914 and Marriages 1950-2016," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKD8-PW1S : 11 February 2018), Elwyn Mccain, 22 Jan 1904; citing Birth, Pennington, South Dakota, United States, South Dakota Department of Health, Pierre.
↑ 2.02.1
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JT3D-XY9 : 10 January 2021), Elwyn Mccain, Aug 1970; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPXF-R9Q : accessed 9 September 2022), Elwyn O Mccain in household of William E C Mccain, Township 2, Pennington, South Dakota, United States; citing enumeration district (ED) ED 89, sheet 5A, family 85, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1486; FHL microfilm 1,375,499.
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"Florida Death Index, 1877-1998," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VV73-ZP3 : 25 December 2014), Elwyn O Mccain, 24 Aug 1970; from "Florida Death Index, 1877-1998," index, Ancestry (www.ancestry.com : 2004); citing vol. , certificate number 50111, Florida Department of Health, Office of Vital Records, Jacksonville.