1962. First Edition. 143 pages. Pictorial dust jacket over blue cloth. Black and white diagrams. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Minor pencil inscriptions to front free endpaper. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Some marks and staining to surfaces. Clipped jacket has heavy wear with large tears, chipping and creasing. Some rubbing and marking to surfaces. Spine noticeably sunned.