1970. Metric Revision. 331 pages. No dust jacket. Grey cloth. Black and white illustrations throughout. Pages are bright and clear with light tanning to text block edges, pastedowns and free endpapers. Light cracking to gutters; some looseness to binding but pages remain attached. Boards have minor corner bumping and edgewear with mild tanning and scuffing overall. Spine has light tanning with soft crushing to ends. Book has a very slight forward lean.