1964. New edition. 494 pages. No dust jacket. Blue cloth covered boards with gilt. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding loose. Previous owner's name to front pastedown. Title page creased. Boards have heavy shelf wear with bumping and fraying to corners and crushing, fraying and tearing to spine ends and edges. All surfaces tanned and sunned, particularly spine. Gilt lettering to spine is dulled but remains brighter on front. Some additional moderate marks and staining.