UPenn (change school)
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| What is my ISBN number? | ||
ISBN codes are unique catalogue numbers that identify a particular item. They can be usually be found on the back cover of your book. ISBN numbers are either 10 or 13 characters long (if a book has both, the 10 character code is prefered).
 Other tips: - If the ISBN for your book isn't found, try entering the UPC. - Some ISBNs end with an X; make sure you enter it as part of the ISBN. - While books may have more than one UPC-like barcode, each book has a single ISBN. - When entering UPCs, make sure you include any smaller numerals that appear to the left or right of the main barcode numerals. | ||
