1938. First Edition. 280 pages. No dust jacket. Brown cloth covered boards. Black and white diagrams throughout. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding slightly loose. Inscriptions to front endpapers. 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. Boards are bowed.