1957. No Edition Remarks. 189 pages. Yellow dust jacket over grey cloth with blue lettering to spine. Diagrams and tables throughout. Binding remains firm. Pages remain bright and clear with moderate tanning to endpapers. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Wear marks to front board. Unclipped jacket has light edgewear with tears and creasing. Moderate foxing to inside panels, heavier to rear panel. Significant wear marks to front and rear panels.