AP Photo/Charles Rex Arbogast
Dr. Bob Archibald, president of the Missouri Historical Society and president of the National Council of the Lewis and Clark Bicentennial, poses with the Letter of Credit penned July, 4, 1803 and signed in President Thomas Jefferson's hand for Capt. Meriwether Lewis for his expedition into the Louisiana Purchase, at the society's library in St. Louis, Mo., Nov. 25, 2002.

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