1967. No edition stated. 188 pages. No dust jacket. This is an ex-Library book. Book has been rebound using the original dustjacket. Expected library inserts, stamps and inscriptions. Graphs and charts throughout. Pages have slight foxing, tanning and minor thumbing. A few dog-eared corners. Occasional minor marginalia and underlining. Boards have some moderate edge wear, with slight bumping to corners and minor bumping to spine ends. Boards rather rubbed and marked overall. Some creasing and bubbling to lamination. Book has a moderate forward lean.