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[en] [Gutenberg 54329] • Symmes's Theory of Concentric Spheres / Demonstrating that the Earth is hollow, habitable within, and widely open about the poles Franklin Classics Trade Press
McBride, James & Symmes, John Cleves
![[Gutenberg 54329] • Symmes's Theory of Concentric Spheres / Demonstrating that the Earth is hollow, habitable within, and widely open about the poles](/cover/8yPDhcNB8sblq2gd/small/[Gutenberg%2054329]%20%e2%80%a2%20Symmes%27s%20Theory%20of%20Concentric%20Spheres%20/%20Demonstrating%20that%20the%20Earth%20is%20hollow,%20habitable%20within,%20and%20widely%20open%20about%20the%20poles.jpg)