found: Don Caesar de Bazan, or, Maritana the Gypsey, 1844?:t.p. (John Duncombe; publisher)
found: LC in OCLC, 7/18/96(hdg.: Duncombe, John)
found: British book trade index [via www, Jan. 23 2009](Duncombe, John; bookseller, printer, music seller, print seller, newsagent. 19 Little Queen St, Holborn; 69 Gt. Queen St; 9/10 Middle Row, Holborn; 17 Holborn Hill. Trading 1817-1854)
found: The original comic magazine, 1832?:number 2, title page (published by J. Duncombe, 19, Little Queen Street, Holborn, [London])
found: England, Select Births and Christenings, 1538-1975, via Ancestry, viewed Sept. 26, 2022:baptism records (John Duncombe; born September 13, 1791 [may have been born in Buckinghamshire], baptised November 5, 1792, Saint Clement Danes, Westminster, London, England; male; father: John Duncombe, mother: Sarah)
found: London, England, Church of England Deaths and Burials, 1813-2003, via Ancestry, viewed Sept. 26, 2022:burial records (John Duncombe; born about 1791, died about 1853 (aged 62), buried October 30, 1853, St. Andrew, Holborn, City of London, England)