1956. 5th Edition. 326 pages. Brown dust jacket over green cloth. Black and white diagrams throughout. Pages and binding are presentable with no major defects. Minor issues present such as mild cracking, inscriptions, inserts, light foxing, tanning and thumb marking. Overall a good condition item. Boards have mild shelf wear with light rubbing and corner bumping. Some light marking and sunning. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Sticker to front flap. Light tanning to spine and edges.