It could be a record-breaking afternoon in the book world. Today, Christie’s New York will auction off a copy of John James Audubon’s Birds of America, which already holds the title of most valuable printed book in the world, having sold for about $11.5 million in 2010. In fact, according to The Economist, a true list of the ten most valuable single books ever sold would have to include five copies of The Birds of America. Though Christie’s is playing their cards close to the vest and estimating a $7 to $10 million sale, today could see a new record for the book. After all, the copy that sold for $11.5 million was estimated at less than the copy on auction today.

To help you brush up on your knowledge of the very old and very valuable, we’ve compiled a list of the ten most expensive books ever sold — no white gloves necessary. Click through for an overview, and then head upstairs to check your attics for any forgotten dusty tomes — you could be a millionaire and not even know it. … Read More