"England and Wales Census, 1861," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWMQ-TM1 : accessed 28 April 2016), Marcus Edwd Marks in household of Levi Marks, Portsea, Hampshire, England; from "1861 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 9, The National Archives, Kew, Surrey.
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