"England Births and Christenings, 1538-1975," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JSDC-LRJ : 30 December 2014), John William Heron, 14 Oct 1877; citing Lambeth, Surrey, England, reference item 10 p 143; FHL microfilm 2,214,953.
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QCD9-9N2 : 15 October 2015), John W Heron in household of Louisa Heron, Lambeth, London, England; 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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