Most Popular Books
- Symzonia; Voyage of Discovery (Puerto Rican Experience)
- Symmes's Theory of Concentric Spheres: Demonstrating that the Earth is Hollow, Habitable Within, and Widely Open about the Poles
- The Trenton circular "To the respectable public" of November 26, 1787. Letter of John Cleves Symmes to Elias Boudinot of January 12 and 15, 1792
