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> if Wikipedia is to be believed, there are books out there issued with ISBNs that aren't valid, so any strong enforcement using the check digit may lead to the occasional issue. I can personally vouch for the veracity of Wikipedia on this point. In a library of our size, I've see it at least a few dozen times over the years. Moreover, a look at OCLC's "020 $z"s could undoubtly reveal many more. Publishers will be, well, let's say, human enough to make mistakes! JJ **Views expressed by the author do not necessarily represent those of the Queens Library.** Jane Jacobs Asst. Coord., Catalog Division Queens Borough Public Library 89-11 Merrick Blvd. Jamaica, NY 11432 tel.: (718) 990-0804 e-mail: [log in to unmask] FAX. (718) 990-8566 The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer.