1937. No edition remarks. 172 pages. No dust jacket. Green cloth covered boards with gilt. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. All surfaces tanned and sunned. Gilt lettering remains bright and clear. Boards are slightly bowed. Book has slight forward lean.