Sixth Edition. 336 pages. No dust jacket. Brown cloth illustrative boards with gilt lettering to spine and black to front. Black and white illustrations & illustrative plates throughout. Binding remains firm. Crinkling to pages at gutters. Pages are moderately tanned throughout. Thumb marking present. Occasional foxing. Previous owner's inscription to front endpaper. Boards have mild edge wear with slight rubbing to surfaces. There is bumping to corners and crushing to spine ends. Tanning to spine and edges. Gilt lettering is darkened and faded. Book has a slight forward lean.