The Symmes's Theory of Concentric Spheres, Demonstrating That the Earth Is Hollow, Habitable Within, and Widely Open About the Poles

Overview:

  • Title: The Symmes's Theory of Concentric Spheres, Demonstrating That the Earth Is Hollow, Habitable Within, and Widely Open About the Poles
  • Author: Capt. John Cleves Symmes
  • Year: 1878
  • Type: Non-fiction