No Edition Remarks. 512 pages. No dust jacket. Brown cloth with gilt and black decoration. Vol. XII. Contains black and white illustrations throughout. Plates to front of textblock, displaying illustrations and diagrams. Pages are mildly tanned and foxed, but text remains clear. Mild marking to some pages throughout; text is not obscured. Binding is slightly shaky, due to cracked front hinge, but all pages remain attached. Boards have moderate shelf-wear, with noticeable corner bumping and some scuffing to edges. Spine and edges are moderately tanned, with mild crushing to ends. Gilt remains bright. Light rubbing and scuffing overall.