"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MFZ9-YT9 : accessed 22 January 2016), Effie M Armstrong in household of Cassius Armstrong, Lebanon, New London, Connecticut, United States; citing enumeration district ED 114, sheet 615D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0108; FHL microfilm 1,254,108.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MCNB-CR2 : accessed 22 January 2016), Effie Foster in household of Cassus Armstrong, Norwich, New London, Connecticut, United States; citing sheet 15A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,197.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MJK3-SV4 : accessed 22 January 2016), Effie M Foster in household of Cassius M Armstrong, Richmond, Washington, Rhode Island, United States; citing sheet 10A, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,681.
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