1967. Revised edition. 147 pages. Illustrated jacket over blue cloth with gilt titles to spine. Includes photographic plates. Includes various diagrams. First edition under this title. Pages have slight foxing, tanning and minor thumbing. Some pencil scribbles on p15, not obscuring text, and both endpapers. Plates are clean with minor thumbing and foxing. Faint creases to some pages. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Gilt is bright. Book has a slight forward lean. Clipped jacket has some edgewear with chips, tears and creasing. A few light scratches and pen impressions. Jacket is slightly rubbed and marked overall.