1961. 5th edition. 275 pages. Blue jacket over red cloth with gilt titles to spine. Includes various diagrams. Blank notes pages to rear. Pages have slight foxing, tanning and minor thumbing. Pencil inscriptions to front endpaper. Faint creases to some pages. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards a little rubbed and marked overall. Gilt is bright. Unclipped jacket has some edgewear with chips, tears and creasing. Jacket is slightly rubbed and marked overall. Spine is noticeably sunned. Slight liquid stains overall.