↑ "United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9R9-29S : accessed 4 July 2019), Hellen Dewhirst in household of George Dewhirst, Groveland Town, Essex, Massachusetts, United States; citing enumeration district (ED) 288, sheet 7A, family 121, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,641. https://www.familysearch.org/ark:/61903/3:1:S3HY-6SK3-8DD?i=12&cc=1325221
↑ "United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXYC-8DZ : accessed 4 July 2019), Helen Dewhirst in household of George F Dewhirst, Groveland, Essex, Massachusetts, United States; citing ED 52, sheet 9A, line 29, family 183, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 690; FHL microfilm 1,820,690. https://www.familysearch.org/ark:/61903/3:1:33SQ-GRF3-8HP?i=16&cc=1488411
↑ "United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQLX-955 : accessed 4 July 2019), George F Dewhirst, Groveland, Essex, Massachusetts, United States; citing enumeration district (ED) ED 285, sheet 5B, line 68, family 100, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 895; FHL microfilm 2,340,630.
↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MH6W-5MW : 8 September 2017), John Mccormick, 1880; citing enumeration district ED 136, sheet 85B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d), roll 0526; FHL microfilm 1,254,526.
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