1961. Third edition. 104 pages. This is an ex-Library book. Laminated pictorial dust jacket over red cloth. Black and white photographs and diagrams. Ex library copy with associated labels, inserts, stamps and annotations. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards assumed in good condition as covered with library laminated jacket. Unclipped jacket has light edge wear with minor tears, chipping and creasing.