1953. Fifth printing. 160 pages. Pictorial dust jacket over pictorial cloth covered boards. Black and white diagrams throughout. Presentation plate to front pastedown. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have mild shelf wear with light rubbing and corner bumping. Some mild marking and tanning. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Spine noticeably sunned.