1944. Fifth printing. 644 pages. No dust jacket. Red cloth covered boards with gilt. Ex libris plate at front. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding slightly loose. 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.