US National Archives
Our Documents: The Louisiana Purchase Treaty (1803)
A fantastic site from the Our Documents group that allows visitors to see an original copy of the Louisiana Purchase Treaty of 1803. This treaty allowed the United States to purchase a tract of land west of the Mississippi River that was...
US National Archives
Nara: American Originals: Louisiana Purchase Treaty
Wonderful NARA site that provides pictures of the original treaty and agreements of the Louisiana Purchase. Brief introduction discusses the amount of land purchased and the cost per acre described by the Purchase.