1956. First Edition. 123 pages. Pictorial dust jacket over black cloth. Black and white photographs and diagrams. 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. Some mild marks and staining to surfaces. Unclipped jacket has heavy edge wear with large tears, chipping and creasing. Spine noticeably sunned.