"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4P1-ZFS : 13 July 2016), Frederick Jonathan Caulkins, 20 Feb 1863; citing Birth, Leominster, Worcester, Massachusetts, United States, , town clerk offices, Massachusetts; FHL microfilm 2,313,271.
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MD3V-KB5 : 17 October 2014), Frederic J Caulkins in household of Louise Caulkins, Massachusetts, United States; citing p. 385, family 3163, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,139.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHX9-R2J : 11 August 2016), Fred J Caulkins in household of L B Caulkins, Cambridge, Middlesex, Massachusetts, United States; citing enumeration district ED 434, sheet 28D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0543; FHL microfilm 1,254,543.
"Massachusetts Marriages, 1841-1915," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:N4MS-8SK : 17 February 2016), Frederick J. Caulkins and Annie B. Bartlett, 09 Jan 1889; citing , Newton, New Hampshire, United States, State Archives, Boston; FHL microfilm 1,415,226.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9TZ-SYH : accessed 12 June 2017), Fredk J Caulkins, Medford city Ward 4, Middlesex, Massachusetts, United States; citing enumeration district (ED) 871, sheet 3A, family 51, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,663.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2VK-DF9 : accessed 12 June 2017), Fredrick J Caulkins, Medford Ward 4, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 932, sheet 2B, family 53, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 602; FHL microfilm 1,374,615.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX1W-5J1 : accessed 12 June 2017), Frederick J Caulkins in household of Helen A Caulkins, Medford Ward 4, Middlesex, Massachusetts, United States; citing ED 319, sheet 13B, line 96, family 301, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 714; FHL microfilm 1,820,714.
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DNA Connections
It may be possible to confirm family relationships with Frederick 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: