"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:7422-1PZ : 23 February 2021), Mary Anne Alice Piershaw in household of James Thomas Piershaw, Horwich, Lancashire, England, United Kingdom; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, Lancashire county, subdistrict, The National Archives of the UK, Kew, Surrey.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9VN-1HX : 21 May 2019), Mary Purchas in household of James T Purchas, Horwich, Lancashire, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Horwich subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XWYT-PNR : 13 August 2019), Mary Purchas in household of James Thomas Purchas, Horwich, Lancashire, England, United Kingdom; from "1911 England and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 14, The National Archives of the UK, Kew, Surrey.
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