"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MCKX-VPF : accessed 22 August 2017), John Calkins in household of Fred Calkins, Grace, Perkins, Nebraska, United States; citing ED 173, sheet 1B, line 62, family 16, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 994; FHL microfilm 1,820,994.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X749-2W6 : accessed 22 August 2017), John H Calkins in household of Frederick Calkins, Denver, Denver, Colorado, United States; citing enumeration district (ED) ED 180, sheet 15B, line 66, family 270, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 239; FHL microfilm 2,339,974.
"Colorado Statewide Marriage Index, 1853-2006," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KN3B-R9J : 31 July 2017), John H Calkins and Qualo Hunzeker Or Hurrzeker, 05 Nov 1935, Littleton, Arapahoe, Colorado, United States; citing no. 18419, State Archives, Denver; FHL microfilm 1,690,059.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVGC-B8N9 : 13 December 2015), John Harvey Calkins, 1967; Burial, Wheat Ridge, Jefferson, Colorado, United States of America, Crown Hill Cemetery; citing record ID 120301003, Find a Grave, http://www.findagrave.com.
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DNA Connections
It may be possible to confirm family relationships with John 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: