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The final digit of the ISBN is a check digit, so once the 3-digit prefix is added, the final digit, the check digit, will need to change in order for the "ISBN formula" that is processed on the 12-digits to equal the new 13th check digit. the isbn.org site states: "Two new prefixes are being created. The 978 prefix will be added in front of the current ISBN-10 and with the addition of a new check digit at the end, the new ISBN-13 is created. To convert an ISBN-10 to and ISBN-13, use this Free ISBN Conversion Tool <http://www.isbn.org/converterpub.asp>. The new 979 prefix will not be utilized until all 978 pre-fixes have been assigned. However, 13 digit ISBNs that begin with 979 can never be converted to 10 digit ISBNs. They have no 10 digit counterpart." This site also gives an example of a title's 10-digit and 13-digit ISBN: ISBN-10: 1-56619-909-3 ISBN-13: 978-1-56619-909-4 [note the different final, or check, digit] Hope this helps. Denise ***************************************************************** Denise A. Garofalo Library Director Astor Home for Children 6339 Mill Street PO Box 5005 Rhinebeck, NY 12572 vox 845 871 1013 fax 845 876 2020 dgarofal@astorservices.org > IMPORTANT NOTICE: This e-mail is meant only for the use of the intended >recipient. It may contain confidential information which is legally privileged or >otherwise protected by law. If you received this e-mail in error or from someone >who was not authorized to send it to you, you are strictly prohibited from >reviewing, using, disseminating, distributing or copying the e-mail. PLEASE >NOTIFY THE SENDER IMMEDIATELY OF THE ERROR BY RETURN E-MAIL AND DELETE THIS >MESSAGE FROM YOUR SYSTEM. Thank you for your cooperation. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.15.3/561 - Release Date: 12/1/06 6:36 AM -------------------------------------------------------------------- Please note: All LM_NET postings are protected by copyright law. You can prevent most e-mail filters from deleting LM_NET postings by adding LM_NET@LISTSERV.SYR.EDU to your e-mail address book. To change your LM_NET status, e-mail to: listserv@listserv.syr.edu In the message write EITHER: 1) SIGNOFF LM_NET 2) SET LM_NET NOMAIL 3) SET LM_NET MAIL 4) SET LM_NET DIGEST * Allow for confirmation. * LM_NET Help & Information: http://www.eduref.org/lm_net/ * LM_NET Archive: http://www.eduref.org/lm_net/archive/ * EL-Announce with LM_NET Select: http://elann.biglist.com/sub/ * LM_NET Supporters: http://www.eduref.org/lm_net/ven.html --------------------------------------------------------------------