1949. Fourth Printing. 566 pages. No dust jacket. Green cloth covered boards with gilt. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Cracking to hinges with exposed netting. Binding loose. A previous owner's name to front free endpaper. Small bookshop label to front pastedown. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces heavily tanned, particularly spine. Gilt lettering to spine is slightly dulled.