1950. Sixth edition. 415 pages. No dust jacket. Blue cloth covered boards with gilt. Black and white illustrations and colour photographs. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Some page corners folded. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. Some mild marks and staining to surfaces. Boards are slightly bowed.