Dilsia, ISBNs are changing from 10 digits to 13 digits. 13 digit ISBNs won't be required until next year, but many publishers have begun using it and assigning both 10 and 13 digit ISBNs to their books. Bookshare hasn't yet notified us that they can handle 13 digit ISBNs, so you should continue to use the 10 digit ISBN until you hear differently. HTH Gerald _____ From: Dilsia A. Martinez [mailto:dilsiam@xxxxxxxxx] Sent: Sunday, November 05, 2006 7:05 PM To: bookshare-discuss@xxxxxxxxxxxxx Subject: [bookshare-discuss] ISBN numbers on newer books Dear Booksharians: I have a question about ISBN numbers, recently I've been observing that the books have fronm two to several ISBN's numbers. For example The End A Series of Unfortunate Events book 13 has four: two on trade binding and two on library binding. I know that we can leave that field blank when we submit but I am very curious, for what purpose are they? I mean what is the difference between two trades or two libraries. Dilsia scratching her head wondering