"Illinois, Cook County, Birth Certificates, 1871-1940," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N73Q-596 : 18 May 2016), Robert William Calkins, 22 Dec 1916; citing Evanston, Cook, Illinois, United States, reference/certificate 712, Cook County Courthouse, Chicago; FHL microfilm 1,308,559.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJW7-WLX : accessed 21 August 2017), Robert Calkins in household of Frank Calkins, Evanston Ward 5, Cook, Illinois, United States; citing ED 81, sheet 17B, line 61, family 258, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 358; FHL microfilm 1,820,358.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSTV-BKW : accessed 21 August 2017), Robert Calkins in household of Frank Calkins, Niles, Cook, Illinois, United States; citing enumeration district (ED) ED 2232, sheet 11B, line 89, family 245, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 504; FHL microfilm 2,340,239.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V9HV-XM7 : 20 May 2014), Robert Calkins, Mar 1977; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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DNA Connections
It may be possible to confirm family relationships with Robert 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: