1972. Fourth Edition. 226 pages. Pictorial paperback. Pages are lightly tanned and foxed throughout. Minor dog-eared corners. Cracking to hinges with covers slightly coming away from text-block. Binding remains firm. Paper cover has moderate edge wear with scuffing to edges and creasing. Scuffed loss to corner of front cover. Light water staining to spine. Mild rubbing to surfaces with curling to corners.