Well, ok, so War and Peace, Harry Potter, American Conservatism: An Encyclopedia , and The Rise of American Democracy: Jefferson to Lincoln ( All MASSIVE Hardcover tomes. ), if used as NOT intended would cause a nasty lump on the noggin, but as a terrorist weapon they don't exactly cut it ( Unless you consider being forced to read one of them to be an act of terror, of course. ).
But there IS a variety of book that could be used to transport weapons of terror if not detected by the observant.
How can you blow up a plane with a book?