1956. Second impression. 410 pages. No dust jacket. Grey cloth covered boards with gilt. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding slightly loose. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Gilt lettering to spine is slightly dulled. Some mild marks and staining to surfaces. Boards are slightly bowed.