1947. No edition remarks. 334 pages. No dust jacket. Green cloth covered boards with gilt. Black and white diagrams throughout. Colour frontispiece. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Some cracking to gutters with exposed netting. Binding loose. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Gilt lettering to spine is slightly dulled.