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

reading copy : Indicates a book that is perfectly serviceable for reading. It may have a defect or damage.

Fair : is a worn book that has complete text pages (including those with maps or plates) but may lack endpapers, half-title, etc. (which must be noted). Binding, jacket (if any), etc., may also be worn. All defects must be noted. (defined by AB Bookman's Weekly)

acceptable : A non-traditional book condition description that generally refers to a book in Good or Very Good condition, although no standard exists for this term, and the word can be used to describe a wide variety of actual book conditions.