"England and Wales Census, 1841," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M73B-286 : 25 May 2019), Mary Sparks in household of John Sparks, Wylye, Wiltshire, 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.
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