"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF88-YFL : 4 April 2020), Elias Calkins, Ovid, Clinton, Michigan, United States; citing family 28, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Find a Grave, database and images (https://www.findagrave.com : accessed 25 August 2020), memorial page for Elias Burton Calkins (22 Sep 1818–13 Jun 1898), Find a Grave Memorial no. 21016606, citing Cherry Grove Cemetery, Clare, Clare County, Michigan, USA ; Maintained by Joanne Weimer (contributor 46858365) .
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DNA Connections
It may be possible to confirm family relationships with Elias by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: