1969. Third Edition. 496 pages. No dust jacket. This is an ex-Library book. Grey and blue cloth with gilt lettering. Black and white graphs throughout. Expected library inserts, stamps and inscriptions. Pages are mildly tanned, but text remains clear. Binding is firm. Boards have heavy shelf-wear, with visible corner bumping and noticeable scuffing to edges. Noticeable crushing and slight splitting to spine ends, with some minor fraying also. Gilt remains bright. Moderate rubbing and heavy marking overall. Label to tail of spine.