1941. First Edition. 120 pages. Green jacket over yellow cloth. Includes illustrated plates. Includes various diagrams. Pages have slight foxing, tanning and minor thumbing. Pencil inscriptions to front endpaper. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards a little rubbed and marked overall. Book has a moderate forward lean. Clipped jacket has light edgewear with small tears and creasing. Jacket is slightly rubbed and marked overall. Slight tape marks to rear.