London: J. Johnson, 1774. [2], ix, [1], 152 pages. Illustrated with a engraved map frontispiece and one other engraved plate. Contemporary full calf re-backed sometime in calf gilt with a red label. 165 x 123 mm. First edition thus. Spine beginning to crack on upper joint, but firm; corners of boards worn; some light spotting; else a very good copy. .