"Ontario Births, 1869-1912," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FMDG-JS6 : 2 March 2021), Ernest Rosco Avery, 03 Dec 1897; citing Birth, Mitchell, Perth, Ontario, Canada, citing Archives of Ontario, Toronto; FHL microfilm 1,906,133.
"Canada Census, 1901," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KHG3-32N : 23 February 2021), Earnest R Avery in household of John Avery, Perth (south/sud), Ontario, Canada; citing p. 9, Library and Archives of Canada, Ottawa.
"Recensement du Canada de 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:276K-XXS : 16 March 2018), Earnest Avery in entry for John Avery, 1911; citing Census, Perth South Sub-Districts 1-33, Ontario, Canada, Library and Archives of Canada, Ottawa, Ontario; FHL microfilm 2,418,517.
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