"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNHW-8DV : 13 August 2016), Otis V Calkins in household of Nelson Calkins, La Grange, Monroe, Wisconsin, United States; citing enumeration district ED 26, sheet 50B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1439; FHL microfilm 1,255,439.
"Wisconsin, County Marriages, 1836-1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XRJ3-1VG : 3 June 2016), Otis Verlin Calkins and Fanella Williamson, 08 Aug 1897; citing , Monroe, Wisconsin
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMKR-KMW : accessed 9 August 2017), Otis Calkries, Lincoln & Grant towns, Monroe, Wisconsin, United States; citing enumeration district (ED) 101, sheet 7A, family 139, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,808.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MP2R-YYK : accessed 9 August 2017), Ottis Calkins, New London Ward 1, Waupaca, Wisconsin, United States; citing enumeration district (ED) ED 87, sheet 12B, family 201, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1743; FHL microfilm 1,375,756.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFK4-2S6 : accessed 9 August 2017), Otis V Calkins, Shawano Ward 2, Shawano, Wisconsin, United States; citing ED 117, sheet 6B, line 82, family 140, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 2016; FHL microfilm 1,822,016.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9SB-75J : accessed 9 August 2017), Otis V Calkins, Shawano, Shawano, Wisconsin, United States; citing enumeration district (ED) ED 34, sheet 7B, line 77, family 169, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2612; FHL microfilm 2,342,346.
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DNA Connections
It may be possible to confirm family relationships with Otis 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: