1968. Twenty-Eighth Impression. 448 pages. Dust jacket over green cloth. Black and white illustrations throughout. Clean pages with mild foxing throughout. Tightly bound with faint thumb-marking throughout. Pencil inscription to front pastedown. Moderate foxing to text block edges. Boards have light shelf-wear with corner bumping. Mild tanning to spine and board edges. Mild crushing to spine ends. Clipped jacket has moderate edgewear with chips, tears, and creasing. Heavy foxing. Heavy tanning to spine and edges. Light rubbing and marking all over.