1966. 11th edition. 744 pages. Blue jacket over blue cloth. Pages are lightly tanned and thumbed at the edges, with light foxing. Binding has remained firm. Boards are a little rub worn, slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are mildly crushed. Tanning to spine and edges. Boards are bowed. Book has a forward lean. The unclipped dust jacket has moderate edge wear, tears and chips to edges and spine ends. Tanning to spine and edges.