Turns out I was wrong.
There's at least one book that could kill you (maybe there are more, I haven't checked).
The book Shadows from the Walls of Death: Facts and Inferences Prefacing a Book of Specimens of Arsenical Wall Papers by Robert Kedzie contains a collection of wallpaper samples...that are toxic. I am uncertain if reading the book could actually kill anyone, but most libraries that owned copies eventually removed them from their collections and destroyed them. So, it's a pretty rare title. The remaining copies are in special collections, and their pages are encapsulated in plastic so the arsenic can't hurt anyone.
Kind of makes those parents who storm the library and demand that Harry Potter be removed from the shelves look a little silly.
You can actually look at a digital copy of one of these books at the National Library of Medicine. As far as I know, you can't get arsenic poisoning over the Internet.
