When compared to the rival Blaeu county maps, those of Jansson always appear more decorative. This map of Somerset, with German text to the verso is taken from the very first issue in 1636 according to the research of Peter van der Krogt. All so-called pre-issue Jansson county maps are rare and desirable. A comparison of the two states shows that the ornate title cartouche was entirely re-engraved in the lower left. In its place a series of coats of arms were added. Jansson was a very successful publisher who continued the business first founded by the great Gerard Mercator and subsequently taken over by the Hondius family. Koeman (1967-70) II ME 44 no. 411; Van der Krogt (1997-2003) 5235:1.1; Map Collectors Circle no. 34 Notes and Addenda pp. 16-18; Needell (1995) 56; Skelton (1970) no. 34, pp. 225-6.