Google Book Search highlights banned books

I just came across a banned book page in Google Book Search where you can browse 42 classics that have been challenged or banned.

To Kill a Mockingbird. Of Mice and Men. The Great Gatsby. 1984. It’s hard to imagine a world without these extraordinary literary classics, but every year there are hundreds of attempts to remove great books from libraries and schools. In fact, according to the American Library Association, 42 of 100 books recognized by the Radcliffe Publishing Course as the best novels of the 20th century have been challenged or banned.