"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ3Z-VFP : accessed 25 August 2017), Nelson Calkins in household of William A Calkins, Isabella, Isabella, Michigan, United States; citing ED 203, sheet 5B, line 70, family 111, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 770; FHL microfilm 1,820,770.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQBQ-BNR : accessed 25 August 2017), Nelson Calkins in household of William Calkins, Isabella, Isabella, Michigan, United States; citing enumeration district (ED) ED 11, sheet 4A, line 18, family 64, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 995; FHL microfilm 2,340,730.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4LK-LSJ : accessed 25 August 2017), Nelson Calkins, Rosebush, Isabella Township, Isabella, Michigan, United States; citing enumeration district (ED) 37-11, sheet 2A, line 40, family 30, 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 1766.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JRLG-G38 : 20 May 2014), Wm Nelson Calkins, 03 Apr 1996; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV2F-MWQB : 13 December 2015), William Nelson Calkins, 1996; Burial, Rosebush, Isabella, Michigan, United States of America, Woodland Cemetery; citing record ID 70554866, Find a Grave, http://www.findagrave.com.
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: