1985. Sixth Edition. 112 pages. Pictorial dust jacket over pictorial paper covered boards with blue cloth to spine. Black and white illustrations throughout. Colour and black and white photographic plates to last few pages. Binding remains firm. Pages and illustrations remain bright and clear with marking to rear pastedown. Boards have moderate shelf-wear with bumping to corners and rubbing to surfaces. Wear marks overall. Unclipped jacket has light edgewear with chips and creasing. Light tanning to spine and edges. Wear marks overall.