Harvard found out that three of the books within their collection had covers made of human flesh.
But sadly none of them was the Necronomicon.
The pratice of binding books in human skin it’s called Anthropodermic bibliopegy.
It was a real technique which was officially practiced since the 17th century and gained considerable popularity during the French Revolution, among the upper classes in the 19th century.
But if can’t get a good couple of inches of flesh, here’s a tutorial to make you’re own Book of Blood, a replica of the Necronomicon Ex Mortis from Evil Dead.