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If you plan to sell your book through traditional channels--such as bookstores, drug stores or grocery stores--a bar code is needed. You will need either an ISBN or UPC bar code. Selling books through the Internet or at book fairs does not require a bar code.
Source:
PublishingCentral.com: What Is a Bookland EAN?
Tux.org: Free Barcode Generator
More Information:
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