jacket : Sometimes used as another term for dust jacket, a protective and often decorative wrapper, usually made of paper which wraps around the binding of a book

Mass market paperback : Also known as the pocket paperback. A small format paperback usually measuring about 4" by 6".

x-library : An abbreviation for Ex-library former library book, generally containing library acquisition and ownership stamped markings, and other typical indications of the library's use.