1961. First Edition. 232 pages. This is an ex-Library book. Pictorial dust jacket over blue cloth. Black and white portrait frontispiece. 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. Some rust marks from paperclip. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Book has slight forward lean. Unclipped jacket has very heavy edge wear with large tears, chipping and creasing.