In 1830 Darton’s son John Maw Darton (1810-81) joined him in the business and the name was changed around that time to Darton & Son, the imprints on these maps were changed accordingly. The undated atlas is normally ascribed to c.1835. The partnership was dissolved when William Darton retired in 1837. This map of Monmouth bears an attractive uncoloured vignette view of Ragland Castle. One of the main alterations is the addition of Parliamentary information drawn from the Representation of the People Act, otherwise known as the Reform Act, of 1832 which spurred its issue. Not in Chubb (1927); Michael (1985) p. 57; Tooley’s Dictionary (1999-2004); Worms & Baynton-Williams (2011).