1937. No Edition Stated. 171 pages. Orange jacket over black cloth with gilt titles to front and spine. Includes a diagram. Pages have slight foxing, tanning and minor thumbing. Previous owner's inscription to front endpaper. Ex libris plate to front endpaper. Foxing more noticeable towards the start and end of the book. Occasional minor marginalia and underlining. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Mildly dust-marked overall. Gilt is bright. Clipped jacket has some edgewear with chips, tears and creasing. Jacket is slightly rubbed and marked overall.