Bookbinding is the process of physically assembling a book from a number of folded or unfolded sheets of paper or other material. It usually involves attaching a book cover to the resulting text-block. The bookbinding trade normally involved two divisions. First, there is stationery or vellum binding which deals with making new books intended to be written into, such as accounting ledgers, business journals, and guest log books, along with other general office stationery such as note books, manifold books, portfolios, etc. Second is letterpress binding which deals with making new books intended to be read from and includes fine binding, library binding, edition binding, and publisher's bindings. A result of the new bindings is a third division dealing with the repair, restoration, and conservation of old used bindings. With computronics widespread, GalNet and PDDs have replaced books, making them rarities on planets above late TL 2. Today, modern bookbinding is usually hand binding by individual craftsmen versus mass-produced bindings by high speed machines.