The Symmes theory of concentric spheres,
demonstrating that the earth is hollow, habitable within, and widely open about the poles.
Compiled by Americus Symmes from the writings of his father, Capt. John Cleves Symmes.
APA Citation
Symmes, J. Cleves., Symmes, A. (1878). The Symmes theory of concentric spheres: demonstrating that the earth is hollow, habitable within, and widely open about the poles. Louisville, Ky.: Printed by Bradley & Gilbert.
MLA Citation
Symmes, John Cleves, 1780-1829, and Americus Symmes. The Symmes Theory of Concentric Spheres: Demonstrating That the Earth Is Hollow, Habitable Within, And Widely Open About the Poles. Louisville, Ky.: Printed by Bradley & Gilbert, 1878.
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