"England and Wales Census, 1861," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M75C-RV5 : 3 March 2021), Robert A A McLennen in household of Sarah McLennen, St Pancras, Middlesex, England, United Kingdom; 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.
"England and Wales Census, 1871", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBDM-T93 : 24 April 2019), Robert A McLelland in entry for John A McLelland, 1871.
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