Fourth Edition. 96 pages. No dust jacket. This is an ex-Library book. Green cloth. Book has been rebound by library, with expected inserts, stamps and inscriptions. Black and white illustrations throughout. Black and white photographic plates to centre of book. Binding remains firm. Pages and illustrations are lightly tanned throughout. Tears to some pages. Boards have moderate shelf-wear with bumping to corners and rubbing to surfaces. Slight crushing to spine ends. Staining to both boards.