1955. First Edition. 378 pages. No dust jacket. Blue cloth covered boards with gilt. 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. Pencil inscriptions to front free endpaper. Small bookshop label to front pastedown. Boards have heavy shelf wear with bumping and fraying to corners and crushing and fraying to spine ends. All surfaces heavily tanned, particularly spine. Gilt lettering to spine is slightly dulled. Some additional mild marks and staining. Boards are slightly bowed.