Where would you find an ISBN number?
The International Standard Book Number (ISBN) is a 13-digit number that uniquely identifies books and book-like products. The purpose of the ISBN is to identify the registrant as well as the specific title, edition and format. An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an e-book, a paperback and a hardcover edition of the same book will each have a different ISBN. The ISBN is ten digits long if assigned before 2007, and thirteen digits long if assigned on or after 1 January 2007.
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