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Well, Boker and the Fed look down on having two ISBN's on the same book. So if you already have one, as long as it's a valid ISBN and not a private one, then that's all you'll need. Now there is the possibility that what B&N and Smashwords are doing is issuing private ISBN's, which they're allowed to do, but really they're PSBN's and not ISBN's, since the ISBN is internationally recognized, and PSBN is recognized only locally on the issuing site. So be sure what you get. ASIN is sorta the same thing with private and international versions. Another thing to consider is that regular bookstores won't recognize PSBN's. Only ISBN's. So be sure that if you get a number from B&N or Smashwords that it's a real, live ISBN.
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