1950. First Edition. 128 pages. Pictorial dust jacket over red cloth. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Some cracking to gutters with exposed netting. Binding slightly loose. Names to front endpapers. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces heavily tanned and sunned, particularly spine. Gilt lettering to spine is slightly dulled. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Some tanning and foxing to all surfaces, particularly to spine.