"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ45-2TL : accessed 21 August 2017), J A Calkins, Cuba, Lake, Illinois, United States; citing ED 245, sheet 5A, line 14, family 119, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 381; FHL microfilm 1,820,381.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSBH-PSM : accessed 21 August 2017), Judd Calkins, Barrington, Lake, Illinois, United States; citing enumeration district (ED) ED 14, sheet 4A, line 49, family 91, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 528; FHL microfilm 2,340,263.
"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQ94-3ZT : 8 March 2018), Judd Arthur Calkins, 29 May 1935; Public Board of Health, Archives, Springfield; FHL microfilm 1,754,575.
Find a Grave, database and images (https://www.findagrave.com : accessed 20 August 2020), memorial page for Judd Arthur Calkins (26 Jul 1863–29 May 1935), Find a Grave Memorial no. 75659946, citing Evergreen Cemetery, Barrington, Cook County, Illinois, USA ; Maintained by Wendy M. (contributor 46971886) .
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DNA Connections
It may be possible to confirm family relationships with Judd 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: