Fifth Edition. 96 pages. Brown paper cover. Contains fold-out diagrams. Pages are lightly tanned and foxed throughout. Occasional thumb-marking present. Slight cracking to hinges. Light scuffing to text-block edges. Rust staining to staples visible to last page. Fold-out plates are lightly tanned with some creasing, and torn holes to a few plates. Paper cover has mild edge wear with scuffing to edges and creasing. Small splits to joints. Book has rolled spine. Moderate tanning to spine and edges. Mild rubbing to surfaces with curling to corners.