The ISBN of the item you wish to trade in must exactly match with what is displayed on the website. Just matching the title is not enough, since some Books may have the same title with different editions, but a different ISBN. Also, look carefully for Books with multiple volume editions (Vol-I, Vol-II etc.) and make sure you have all of the items to trade in as a bundle or check if they are eligible as single titles.
Note: The ISBN is a 10 or 13 digit barcode used to uniquely identify books, and is typically printed on the back cover. For example, the ISBN code for J.K. Rowling's "Harry Potter and the Deathly Hallows," Adult Edition, Paperback, UK edition is 978-0747595823, and this code uniquely identifies this book and edition.
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