1939. No Edition Stated. 224 pages. Blue jacket over blue cloth with gilt lettering to spine. Contains black and white illustrations and diagrams throughout. Illustration facing page 158 is detached but still present. Binding throughout remains firm. Pages are moderately tanned with noticeable foxing throughout. More pronounced to text block edges. Illustrations are lightly tanned. Small water drops to top text block edge. Text is unaffected. Boards have slight edge wear with corner bumping. Noticeable tanning to spine and edges with mild crushing to spine ends. Gilt lettering is bright and clear. Small bleaching spots to all surfaces, more pronounced to rear board. Book has a slight forward lean. Clipped jacket. Panels have heavy edge wear with chips, tears and creasing. Substantial areas of loss to spine and edges. Heavy water staining with visible tanning and markings overall.