1940. Sixth impression. 444 pages. No dust jacket. Red cloth covered boards with gilt. Black and white photographs and diagrams. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Some marginalia. Minor inscriptions to front endpapers. Front free endpaper with section cut from top. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Gilt lettering to spine is slightly dulled.