In a library at Cumberland University, history professor Mark Cheathem flips the switch on an electronic scanner.
The image of a letter addressed to Martin Van Buren, the nation's eighth president, pops up on screen.
At least, that's what it appears to be.
The handwriting is a loopy scrawl. The language is outdated. Words written on one side of the page have bled through to the other, making the document even harder to read.