1961. Seventh Edition. 263 pages. Pictorial dust jacket over green cloth. Black and white illustrations throughout. Light thumb marking, foxing and moderate tanning to pages. More prominent to text block edges, pastedowns and free endpapers. Light cracking to gutters but binding remains firm. Book is slightly bowed and forward leaning with visible tanning and scuffing overall. Spine has heavier tanning with soft crushing to ends. Unclipped dust jacket with moderate rubbing, chipping and tearing to edges. Moderate tanning and scuffing overall with visible loss and creasing to panels. Front flap detached but present.