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Sources
"Canada Census, 1851," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWR1-VR1 : 3 August 2016), Thomas Allen, Mountain, Dundas County, Canada West (Ontario), Canada; citing p. 108, line 1; Library and Archives Canada film number C_11717, Public Archives, Ontario.
"Canada Census, 1871," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:M47V-C98 : 24 October 2018), Thomas Allen in household of William Allen, Mountain, Dundas, Ontario, Canada; citing 1871; citing National Archives of Canada, Ottawa, Ontario.
"Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:J6SJ-C4S : 2 April 2020), Thomas Allen, 14 Feb 1890; citing Mountain, Dundas, Ontario, Canada, , Registrar General. Archives of Ontario, Toronto; FHL microfilm .