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Classify is an OCLC Research prototype that helps you classify books, magazines, movies, and music using the Dewey Decimal Classification system or the Library of Congress Classification system.

I LOVE IT! I use it daily while cataloging books to collect useful subjects. It's especially useful when you catalogue a book from beginning.

It's also helping me decide in which collection put the book since it's giving a Dewey Decimal number of the book.

You can search for the book by ISBN, title or author. It's really easy to use and has a massive database.

And, it's FREE! :)

I spared a looooot of time with this tool while cataloging, thank you OCLC Classify!