Ordnance Survey Drawings
The Ordnance Survey Drawings are a series of 351 of the original preliminary drawings made by the surveyors of the Ordnance Survey between the 1780s and 1840 in preparation for the publication of the one-inch-to-the-mile "Old Series" of maps of England and Wales. The drawings are now held in the British Library, and cover most of England south of a line between Liverpool and Kingston upon Hull, as well as parts of Wales.