1966. Second impression. 174 pages. No dust jacket. Pictorial paper covered boards. Black and white and colour photographs and diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. A previous owner's name to front free endpaper. Boards have moderate shelf wear with mild bumping and fraying to corners and some tearing, crushing and fraying to spine ends. Spine noticeably sunned. Some small tape repairs. Boards are slightly bowed.