DJ : Short for dust jacket, a protective and often decorative wrapper, usually made of paper which wraps around the binding of a book.

ISBN : International Standard Book Number

4to : Or quarto. A term used generally to describe the approximate size of a book, a book that is about 10" to 12" tall and roughly squarish in shape. The term is based on the size of paper traditionally used by book printers which has been folded and cut into 16 pages.

Biblio : The Greek root for a variety of words referring to the book, such as bibliography, bibliomania, etc. Also, one of the world's largest internet book search services.

Cloth : Generally refers to a hardcover with cloth covering the outside of the book covers.