1958. 14th edition. 228 pages. No dust jacket. Blue cloth. Black and white diagrams. Pages are lightly tanned and thumbed at the edges, with light foxing. Binding has remained firm. Boards are a little rub worn with slight shelf wear to corners, spine and edges. Corners are a little bumped. Spine ends are a mildly crushed, with small splits and chips. Tanning to spine and edges. Boards are bowed. Book has a forward lean. Water marks to boards and spine.