"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MLXW-79S : accessed 27 November 2018), Iva C Clements in household of Genesel T Clements, Allen, Hancock, Ohio, United States; citing enumeration district (ED) ED 58, sheet 2A, family 24, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1186; FHL microfilm 1,375,199.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDYJ-8XH : accessed 27 November 2018), Ivan Clements in household of General Clements, Portage, Hancock, Ohio, United States; citing ED 71, sheet 6A, line 3, family 125, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1386; FHL microfilm 1,821,386.
"Ohio Deaths, 1908-1953," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X87P-1PN : 8 December 2014), Ivan Clements in entry for Rodney Gene Clements, 14 Sep 1944; citing Lima, Allen, Ohio, reference fn 53753; FHL microfilm 2,032,404.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JBW2-84Z : 20 May 2014), Ivan C Clements, 25 Nov 1987; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Ohio Death Index, 1908-1932, 1938-1944, and 1958-2007," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VKKF-929 : 8 December 2014), Ivan Clements, 25 Nov 1987; from "Ohio, Deaths, 1908-1932, 1938-2007," database and images, Ancestry (http://www.ancestry.com : 2010); citing vol. 27054, certificate number 080158, Ohio Historical Society, Columbus; Ohio Department of Health, State Vital Statistics Unit, Columbus.
Find A Grave, database and images (https://www.findagrave.com : accessed 08 March 2018), memorial page for Ivan G Clements (1905–1987), Find A Grave Memorial no. 73331085, citing Maple Grove Cemetery, Bluffton, Allen County, Ohio, USA ; Maintained by corgilover (contributor 46859310) .
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It may be possible to confirm family relationships with Ivan by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
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