"England and Wales Census, 1871", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VB64-J6X : 11 December 2017), Frederick Nicholls in entry for William Nicholls, 1871.
"England and Wales Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q27S-RJKY : 8 December 2017), Frederick Nicholls in household of William Nicholls, Bow Aka St Mary Stratford-Le-Bow, London,Middlesex, England; from "1881 England, Scotland and Wales Census," database and images, findmypast (http://www.findmypast.com : n.d.); citing p. 12, Piece/Folio 493/67, The National Archives, Kew, Surrey; FHL microfilm 101,774,278.
"England and Wales Marriage Registration Index, 1837-2005," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2D1D-NZL : 13 December 2014), Frederick Nicholls, 1895; from “England & Wales Marriages, 1837-2005,” database, findmypast (http://www.findmypast.com : 2012); citing 1895, quarter 4, vol. 1C, p. 1102, Poplar, London, England, General Register Office, Southport, England.
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9ZW-7SG : 8 April 2016), Frederick Nicholls, Hackney, London, Middlesex, England; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Central Hackney subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
"England and Wales Census, 1911," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XWFC-KGT : 2 August 2017), Frederick Nicholls, East Ham, , Essex, England; 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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