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Keywords from Image Description:
Symmes Concentric Spheres. en Illustration from Symmes's 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 hathitrust org id mdp view upseq size Symmes Americus Symmes John Cleves