1969. No edition remarks. 479 pages. Orange dust jacket over red cloth boards with gilt lettering. Many black & white illustrations and diagrams throughout. Binding remains firm. Minor dog eared corners from pages 157-176. Pages and illustrations remain bright and clear with minimal tanning. One of the front end papers has a crease to its bottom corer. Boards have mild edge wear with slight rubbing to surfaces. One minor bumped corner. Crushing to spine ends, heaviest on tail end. Gilt lettering is bright and clear. Unclipped jacket with heavy edge wear; major areas of loss, heavy chips, tears and creasing especially on back and edges. Almost in 2 pieces. Mild tanning to spine.