The ISBN system recently was changed to 13 digits. Most books published in the last year or so list both the 10-digit and the 13-digit numbers. The reason for the change is to make ISBNs compatible with the UPC barcodes that nearly all products have on them now.|||You should buy used college textbooks at GreenTextbooks.com - Saving the Planet One Textbook at a Time GreenTextbooks.com is your online leader for finding used textbooks, DVDs, CDs. http://www.GreenTextbooks.com
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|||Some books even still have ASIN numbers.
If you want to search for a book, you should use the 13 digit ISBN. It's the most modern tag of the three.
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