1968. 11th ed. 554 pages. No dust jacket. This is an ex-Library book. Blue cloth. Includes 11th edition paperback supplement dated 1982. Expected library inserts, stamps and inscriptions. Pages are lightly tanned and thumbed at the edges, with creased corners and foxing. Pages 407-410 are detached. Boards are a little rub worn with slight shelf wear to corners, spine and edges. Corners are a little bumped and spine ends are a mildly crushed, with small splits and chips. Splitting to spine joints and ends. Tanning to spine and edges. Boards are bowed. Book has a forward lean. Water marks to boards and spine.