"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6D2-2FZ : 12 April 2016), William F Tibbetts in household of A Chandler Tibbetts, Maine, United States; citing p. 7, family 57, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,047.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF3R-PQF : 15 August 2017), William F Tibbetts in household of Alpheus C Tibbetts, Rockland, Knox, Maine, United States; citing enumeration district ED 109, sheet 144B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0482; FHL microfilm 1,254,482.
"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCDB-QQK : 23 September 2017), William F Tibbetts and Gertrude M Burkett, 07 Mar 1907; citing Thomaston, , Maine, United States, Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm.
"Maine, Marriage Index, 1892-1966, 1977-1996," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCNC-C1F : 27 November 2014), William F Tibbetts and Gertrude M Burkett, 07 Mar 1907; citing Marriage, Maine, United States, State Archives, Augusta.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFZG-R8C : accessed 9 January 2019), William F Tibbetts, Rockland Ward 3, Knox, Maine, United States; citing ED 70, sheet 9B, line 65, family 248, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 644; FHL microfilm 1,820,644.
"Maine Vital Records, 1670-1921," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCDB-QQF : 23 September 2017), MM9.1.1/KCDB-QQF: and MM9.1.1/KCDB-QQV:, 1907; citing Rockland, Knox, Maine, United States, Division of Vital Statistics, State Board of Health, Augusta; FHL microfilm.
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