"Canada Census, 1871," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:M4W3-7L8 : 11 March 2018), Mary Ann Thornton, Perth, South Lanark, Ontario, Canada; citing p. 13, line 19; Library and Archives Canada film number C-10018, Public Archives, Ottawa, Ontario; FHL microfilm 4,396,764.
"Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:JFNM-12C : 9 March 2018), Mary Ann Thornton, 26 May 1886; citing Ontario, 430, Archives of Ontario, Toronto; FHL microfilm 1,853,482.
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