Symmes's Theory of Concentric Spheres: Demonstrating that the Earth is hollow, habitable within, and widely open about the poles

McBride, James · 1829

Transcriber's Note: Italic text is denoted by _underscores_ and bold text by =equal signs=. DEMONSTRATING THAT THE EARTH IS HOLLOW, HABITABLE WITHIN, AND WIDELY OPEN ABOUT THE POLES.…

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