1961. Fourth edition. 327 pages. No dust jacket. Blue moire cloth with gilt titles and decoration to front and spine. Includes illustrated plates, tipped in. Includes various diagrams. Pages are rather marked with pronounced tanning and foxing, plus thumbing. Plates are clean with minor thumbing and foxing. Foxing more noticeable towards the start and end of the book. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Faint water stains to rear. Spine is heavily sunned. Strips of sunning front and rear. Small holes to rear joint. Boards a little rubbed and marked overall. Gilt is bright.