Thirteenth Edition; Revised. 495 pages. No dust jacket. Green cloth. Black and white illustrations throughout. Pages are moderately tanned with visible foxing to endpapers. Mild cracking to gutters, however binding remains firm. Pencil inscription to front endpaper. Mild thumb-marking present. Boards have light edgewear with corner crushing and mild marking to boards. Moderate tanning to spine, which has mild crushing to ends. Mild water stains and droplets to rear board. Books has a backward lean.