NORMAL, Ill. -- Two professors at Illinois State University are uncovering a piece of history from the 16th president.
Until recently, there had only been ten leaves to the oldest surviving manuscript written by Abraham Lincoln.
That's until ISU professors Dr. Nerida Ellerton, and Dr. Ken Clements, came across the antique papers at Harvard University, which turned out to be the authentic 11th leaf.
The two pages are full of math work done by the young mister Lincoln.
A local Lincoln historian says these artifacts shine light on his life before the white house.
Director and editor of Papers of Abraham Lincoln project Daniel Stowell says, "I think that it gives us insight into Lincoln's early life, into that dedication to do things correctly, that, that he carried with him through the rest of his life."
Abraham's Lincoln's eleven manuscript leaves are scattered across the nation, including the Abraham Lincoln Presidential Library in Springfield.