Kelly, some books list both the ISBN for the hardcopy and for the paperback volume in the same print copy. These are likely cheap editions. Guido Dante Corona IBM Accessibility Center, Austin Tx. Research Division, Phone: 512. 838. 9735. Email: guidoc@xxxxxxxxxxx Web: http://www.ibm.com/able "Kellie Hartmann" <hart0421@xxxxxxx> Sent by: bksvol-discuss-bounce@xxxxxxxxxxxxx 04/01/2005 01:32 PM Please respond to bksvol-discuss To <bksvol-discuss@xxxxxxxxxxxxx> cc Subject [bksvol-discuss] Re: "Water" validation Robert, I've never seen more than one ISBN number in the same book. If there is more than one edition of the book each edition will have its own ISBn, but that doesn't matter. Just use the one in the book you have. If there are other numbers they're probably Library of Congress catalog numbers etc. And if you find a book that's weird and confusing and appears to have ISBns, you don't actually have to enter one at all, they're optional for Bookshare submission. Kellie