"England and Wales Census, 1841," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MQB3-LZD : 5 March 2021), Mary Brewer in household of Edward Brewer, St Ervan, Cornwall, England, United Kingdom; from "1841 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives, Kew, Surrey.
"England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SG17-HBZ : 11 September 2019), Mary Brewer in household of Edward Brewer, St Ervan, Cornwall, England; citing St Ervan, Cornwall, England, p. 24, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.