This large-scale map of Yorkshire is published by William Colling Hobson (d.c.1878). Amongst his works are several engraved by J. & C. Walker including this. The most recognisable is probably ‘Walker’s Fox Hunting Atlas’. The Walkers were part of an extensive family, many of whom were in the map business. John Walker (fl.1813-73) was a brother to Charles Walker (1799?-1872) and in about 1827 they formed the partnership of J. & C. Walker. The map is considered a reduction of the Christopher Greenwood’s extremely large 9 sheet map in its second edition of 1828 by Henry Teesdale. This map was first published in 1843, this is an example of the third edition according to Rodger. There were two in 1843, the first bears the date July 1843, the second September 1843 and a publisher’s address is added. Three further editions were to appear. The railways are here coloured in red. Rodger (1972) 532; Tooley’s Dictionary (1999-2004); Worms & Baynton-Williams (2011).