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What's an ISBN?

The ISBN is a 10 or 13 digit number that is unique to a particular book title, author, edition, and publisher. It can be found on the back cover of each book, above the bar code. Since different editions of the same book title will carry different ISBNs - and different editions of the same textbook may have different sellback prices - it is important that you input your book's exact ISBN number in order to receive an accurate quote. If there are stickers covering your book's ISBN, please remove them before sending the book in for sellback.