1948. Sixth Edition. 154 pages. Yellow dust jacket over blue cloth. Contains black and white illustrations throughout. Pages remain bright and clear with minimal tanning and foxing. Thumb-marking present. Visible creasing to gutter. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Light crushing to spine ends. Minor marks to boards. Clipped jacket has light edgewear with tears and creasing. Visible tanning to spine. Some rubbing to surfaces.