1937. No edition remarks. 60 pages. No dust jacket. Pictorial cloth covered boards. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Cracking to front hinge with netting exposed. Binding slightly loose. Dedication to front pastedown. 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.