1964. Fourth edition. 320 pages. Pictorial dust jacket over blue cloth. Black and white illustrations throughout and colour illustration plates. Maps across endpapers. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Dedication to half-title page. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine ends. Unclipped jacket has light edge wear with minor tears, chipping and creasing. Some tanning and foxing to all surfaces, particularly to spine.