1964. 3rd edition 3rd impression. 93 pages. Illustrated jacket over yellow cloth. Includes illustrations throughout. Includes various diagrams. Pages have slight foxing, tanning and minor thumbing. Foxed, mottled pastedowns. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards rather rubbed and marked overall. Mottled and grubby overall. Unclipped jacket has some edgewear with chips, tears and creasing. Jacket is slightly rubbed and marked overall.