No edition remarks. 268 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. Binding remains firm. Some page corners folded. Boards have heavy shelf wear with bumping and fraying to corners and crushing, fraying and tearing to spine ends and edges. All surfaces heavily tanned, particularly spine. Gilt lettering to spine is slightly dulled.