"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9RH-YM3 : accessed 4 March 2020), Margaret Curtis in household of Harriet Curtis, Manchester town, Essex, Massachusetts, United States; citing enumeration district (ED) 404, sheet 7A, family 123, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,645.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2K5-5PQ : accessed 4 March 2020), Margaret Curtis in household of Harriot Curtis, Boston Ward 11, Suffolk, Massachusetts, United States; citing enumeration district (ED) ED 1419, sheet 20A, family 323, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 618; FHL microfilm 1,374,631.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MF9Z-WBP : accessed 4 March 2020), Margaret Curtiss in household of Harriet G Curtiss, Boston Ward 8, Suffolk, Massachusetts, United States; citing ED 684, sheet 5A, line 37, family 132, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 742; FHL microfilm 1,820,742.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K4J2-33L : 5 December 2019), Margaret Curtis in household of Frances Curtis, Ward 5, Boston, Boston City, Suffolk, Massachusetts, United States; citing enumeration district (ED) 15-208, sheet 9B, line 57, family 236, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1663.
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