American Antiquities, and Discoveries in the West: Being an Exhibition of the Evidence that an Ancient Population of Partially Civilized Nations, Differing Entirely from Those of the Present Indians, Peopled America, Many Centuries Before Its Discovery by Columbus. And Inquiries Into Their Origin, with a Copious Description of Many of Their Stupendous Works, Now in Ruins. With Conjectures Concerning what May Have Become of Them