1954. First Edition. 159 pages. This is an ex-Library book. Pictorial dust jacket over green cloth. Black and white diagrams throughout. Ex library copy with associated labels, inserts, stamps and annotations. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Unclipped jacket has heavy edge wear with large tears, chipping and creasing.