What is the largest isbn search engine you know of?

Im looking for an engine that looks at atleast over 100 sites for books.|||WorldCat is the world's largest network of library content and services:


http://www.worldcat.org/advancedsearch


(use the drop down menu to select ISBN search)





If you're interested in purchasing a book rather than borrowing from a library you could look at Books in Print. This database is available on many library Websites. You will need a library card or student ID to login and have free access. Otherwise, you may want to call the library and ask.





Are you looking for a site that searches booksellers like Amazon, Barnes%26amp;Noble, etc.?





Ask more questions through a library site!


Examples:


http://www.asknow.org/


http://www.askcolorado.org/


http://www.askusnow.info/