You may not have thought too much of it when you bought your first Harry Potter book or that tattered copy of The Catcher in the Rye from a garage sale, but you might want to look again. Here are some very valuable first editions and what they are worth, using prices from AbeBooks and other book dealers and auction houses. Click or scroll through to find out the books that are worth a fortune. Note that the highest prices only tend to be achieved for pristine first-edition hardback copies with their original dustjacket coverings, if applicable. All dollar values in US dollars.