↑ "Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q29G-15YC : 18 February 2020), William O Armstrong and Elizaberth Hayward, 04 May 1872; citing Marriage, Boston, Suffolk, Massachusetts, United States, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007011041.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHXV-TVP : 12 August 2017), H A E Armstrong in household of Wm O Armstrong, Boston, Suffolk, Massachusetts, United States; citing enumeration district ED 645, sheet 353B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,555.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9YP-43N : accessed 14 August 2020), Elizabeth Armstrong in household of William O Armstrong, Precinct 4 Boston city Ward 22, Suffolk, Massachusetts, United States; citing enumeration district (ED) 1495, sheet 12A, family 253, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,687.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M22W-G63 : accessed 14 August 2020), Harriet Armstrong in household of William O Armstrong, Boston Ward 22, Suffolk, Massachusetts, United States; citing enumeration district (ED) ED 1600, sheet 12A, family 239, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 623; FHL microfilm 1,374,636.
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