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A map of western part of North America showing the route of Meriwether Lewis and William Clark took from St. Louis to the Pacific Ocean on the expedition from 1804 to 1806. "The American Enlightenment: Treasures from the Stanford University Libraries," an exhibition that will display rare books from the great age of intellectual discovery and innovation that produced the American Revolution among other events, will open at Stanford's Green Library on February 7, 2011. It is curated by Caroline Winterer, Professor of American History at Stanford University, in collaboration with John E. Mustain, Curator of Rare Books at the Stanford University Libraries. (Dai Sugano/Mercury News) (Photo by MediaNews Group/Mercury News via Getty Images)