30th Edition. 336 pages. Light blue dust jacket over blue paper covered boards with green cloth to spine. Black and white illustrations throughout. Binding remains firm. Pages and illustrations are lightly tanned throughout. Pencil inscription to front free endpaper. Water stain to rear pastedown. Boards have moderate shelf-wear with bumping to corners and rubbing to surfaces. Slight crushing to spine ends. 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 overall.