1968. 5th Edition. 536 pages. Green cloth. Black and white illustrations throughout. Slight cracking to hinges, with exposed netting, pages remain attached. Pages and illustrations have light tanning and foxing throughout. Creasing to some pages. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Paper residue to both boards. Wear marks overall. Unclipped jacket has heavy edgewear with areas of loss, heavy tears, chips, and creasing. Light tanning to spine and edges. Wear marks and foxing overall.