"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNS6-KCC : 12 April 2016), Henry Calkins in household of Henry Calkins, Wisconsin, United States; citing p. 25, family 194, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,242.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFDJ-MMM : 13 August 2016), Henry A Calkins in household of Henry D Calkins, Vasquez, Jefferson, Colorado, United States; citing enumeration district ED 63, sheet 272A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0091; FHL microfilm 1,254,091.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQM8-3QM : accessed 17 August 2017), Henry A Calkins in household of Eleanor Calkins, Precinct 20-23 Lakewood, Arvada, Manhattan, Berkeley, Jefferson, Colorado, United States; citing enumeration district (ED) 221, sheet 7B, family 120, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,125.
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DNA Connections
It may be possible to confirm family relationships with Henry 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: