1947. First Edition. 483 pages. No dust jacket. Blue cloth with gilt lettering. Black and white graphs and illustrations throughout. Moderate tanning to pages with noticeable staining to hinges, pastedowns and free endpapers. Pen inscription to front free endpaper. Pencil inscription to rear free endpaper. Binding remains firm. Boards have minor corner bumping and edgewear with moderate tanning and scuffing overall. Spine has moderate tanning with noticeable fraying and crushing to ends. Lettering remains bright and clear. Book has a slight forward lean.