London: Unwin Hyman, 1987. Fiftieth anniversary edition, first printing, 8vo.,pp. xvi,256, hardcover, gilt, b/w illustrations, maps to endpapers; ownership inscription to front free endpaper, light toning and foxing to edges of text block, small stain to margin of p.254, a very good copy, in a very good unclipped pictorial dust-jacket, which is rubbed to extremities, with light wear to rear corner of head of spine and to upper corners.