1951. First Edition. 163 pages. No dust jacket. This is an ex-Library book. Blue cloth with gilt lettering. Black and white photographic plates and graphs throughout. Expected library inserts, stamps and inscriptions. Pages are bright and clear; light tanning to page edges. Thumb marking present. Pencil inscription and sticker to front pastedown. Binding remains firm. Boards have minor corner bumping and edgewear with visible bubbling and scuffing overall. Spine has moderate tanning with soft crushing to ends. Sticker to front board. Lettering remains bright and clear.