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ISBN stands for International Standard Book Number. It is a unique, machine-readable identification number, which marks a book like a person's thumbprint marks that individual. This worldwide 10-digit number (soon to be 13 digit) is divided into the following four parts, each separated by a hyphen:
*Their website features an online application and a printable application that you may submit through the U.S. mail. The minimum number of ISBN's that can be purchased is 10 and is soon to go to 13.