1957. No edition remarks. 666 pages. No dust jacket. Pictorial cloth covered boards. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding slightly loose. Slight thumb marking in places. 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 dulled but remains brighter on front.