"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M59Y-76T : accessed 6 July 2017), Frederick R Calkins, Watertown Ward 3, Jefferson, New York, United States; citing enumeration district (ED) ED 52, sheet 8B, family 203, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 954; FHL microfilm 1,374,967.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJLL-VBT : accessed 6 July 2017), Frederick R Calkins, Watertown Ward 4, Jefferson, New York, United States; citing ED 50, sheet 3B, line 64, family 68, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1116; FHL microfilm 1,821,116.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X7ZG-TG8 : accessed 6 July 2017), Frederick R Calkins, Watertown, Jefferson, New York, United States; citing enumeration district (ED) ED 57, sheet 9A, line 22, family 222, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1443; FHL microfilm 2,341,178.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KQ1F-FZZ : accessed 6 July 2017), Frederick Calkins, Ward 4, Watertown, Watertown City, Jefferson, New York, United States; citing enumeration district (ED) 23-73, sheet 4A, line 20, family 86, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2545.
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVG7-PWPT : 13 December 2015), Frederic Russell Calkins, 1945; Burial, Watertown, Jefferson, New York, United States of America, Brookside Cemetery; citing record ID 112400851, Find a Grave, http://www.findagrave.com.
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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: