"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZY3-7CC : accessed 18 July 2017), Mattie Blackmore in household of Eugene Blackmore, Richmond, Chittenden, Vermont, United States; citing ED 66, sheet 3A, line 38, family 45, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1872; FHL microfilm 1,821,872.
"Vermont Vital Records, 1760-1954," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XFKB-3MY : 6 December 2014), Mattie Pecor in entry for Bertha Marietta Blackmore, 31 Mar 1923, Birth; State Capitol Building, Montpelier; FHL microfilm 1,983,594.
"Vermont Vital Records, 1760-1954," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XFKB-7Q3 : 6 December 2014), Martha Helen Pecor in entry for Homer Joseph Ploof and Marietta Martha Blackmore, 05 Sep 1940, Marriage; State Capitol Building, Montpelier; FHL microfilm 1,983,594.
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