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International Standard Book Number (ISBN)

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The International Standard Book Number (ISBN) is a unique numeric commercial book identifier based upon the 9-digit Standard Book Numbering (SBN) code. The 10-digit ISBN format was developed by the International Organization for Standardization (ISO) and was published in 1970 as international standard ISO 2108. Since 1 January 2007, ISBNs have contained 13 digits.
 

 International Standard Book Number (ISBN)