An Atlas of the English Counties
The 1830 is uncoloured and the 1831 is coloured, but more importantly the 1831 shows the North and South Parliamentary Divisions that will come into being as part of the 1832 Reform Act.
Scale correct at 10 miles = 63mm, or 4.0 miles/inch, ie 1:255,000.
The maps had been copied from Ebden's 1828 maps.