"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q3BG-PN2 : 2 May 2019), Ernest J Percival in household of Henry Percival, Plumstead, Greenwich, London, England, United Kingdom; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, London county, subdistrict, The National Archives of the UK, Kew, Surrey.
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