MARTYN, Thomas. A New and Accurate Map of the County of Cornwall, from an Actual Survey. [London: no publisher], November 26th, 1748. Very large engraved map on 48 sections mounted on linen, elaborate title and dedication cartouche, numerous coats-of-arms of subscribers, inset plan of the Isles of Scilly, compass rose, galleons (lightly browned, some separation and minor fraying at folds, a few inconspicuous repairs), approximately 1,440 x 1,750mm., folding into contemporary marbled wallet (worn). RARE.