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

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A.N. : When used to describe the condition of a book refers to As New, "the book is in the same immaculate condition in which it was published. There can be no defects, no missing pages, no library stamps, etc., and the dust jacket (if it was issued with one) must be perfect without any tears," as defined by AB Bookman's Weekly

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