Like new, appears unread, unclipped and not remaindered. The interior is clean and unmarked. Bright gilt titles to spine. Unclipped dustjacket has 2mm x 5cm loss to the top edge of the rear wrap with light bumping to extremities and a bit of shelfwear to show. Tons of photographs, blue prints, line drawings, and isometric diagrams providing a rather technical description of her design and operation.