8vo : Short for Octavo, A book whose page size is approximately 12 inches by 9 inches. The size is based on a sheet of paper 25 inches by 38 inches, the size of paper traditionally used by book printers, which has been folded and cut into 16 pages.. Unfortunately often misunderstood to mean 8 volumes.

shelf wear : Minor wear resulting from a book being place on, and taken from a bookshelf, especially along the bottom edge.