1974. First Edition Thus. 477 pages. Dust jacket over grey cloth boards. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Minor pencil inscriptions to front free endpaper. 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. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Some rubbing and marking to surfaces.