1946. Third Impression. 640 pages. No dust jacket. Green cloth with gilt lettering to spine. Contains black and white diagrams and graphs throughout. Shaky binding due to cracked hinges, but all pages remain attached. Pages are mildly tanned and foxed, but text remains clear. Price inscription to front free endpaper, with sticker to pastedown opposite. Previous owner's inscription to title page. Boards have moderate shelf-wear, with noticeable corner bumping and some scuffing to edges. Spine is slightly tanned, with visible crushing and noticeable splitting to ends. Gilt remains bright. Heavy rubbing and scuffing overall, most noticeable to spine. Book has a slight forward lean.