1964. Revised edition. 322 pages. No dust jacket. This is an ex-Library book. Green cloth. Revised by J A G Thomas. Includes various diagrams. Expected library inserts, stamps and inscriptions. 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. Spine and parts of boards are heavily sunned and foxed.