1951. Fourth Edition. 236 pages. Beige and green illustrated dust jacket over green cloth boards with white lettering to spine. 2 Black and white illustrative plates throughout. Binding remains firm. Crinkling to pages at gutters. Pages remain bright and clear with minimal tanning. Occasional foxing. Boards have mild edge wear with slight rubbing to surfaces. Crushing to spine ends. Tanning to spine and edges. Lettering is darkened slightly. Boards are bowed. Book has a slight forward lean. Unclipped jacket has moderate edge wear with chips, tears and creasing. Tanning to spine and edges.