1939. Revised Edition. 658 pages. No dust jacket. This is an ex-Library book. Pictorial cloth covered boards. Black and white diagrams. Ex library copy with associated labels, inserts, stamps and annotations. 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.