Book database (slightly OT)

Hi, I am working on a projects for book cataloging. What I want to do is to input all the books isbn to a mysql table, either by hand or by scanning it, and then let php go through those data and add more info such as tittle, author, publisher, etc. Now, the real question is, does anyone know is there any database / services out there that I can query using isbn, that will return me a parse-able info for this purpose? I am looking for service that is free, if possible, since this project is not for commercial at all (academic purposes). Any information on this will be greatly appreciated. Thanks. Reuben D. Budiardja