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Bernard, Raymond – THE HOLLOW EARTH.  1969.

Culmer, Frederick – THE INNER WORLD, A NEW THEORY, 1886.

Emerson, Willis George – THE SMOKY GOD, 1908

Euler, Leonard (1707-1783) – Writings on the Hollow Earth. 

Gardner, Marshall B. Gardner – A JOURNEY TO THE EARTH’S INTERIOR, OR HAVE THE POLES REALLY BEEN DISCOVERED?  1813.

Halley, Edmund – Articles on the Hollow Earth in the PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY, 1692.

Ives, Franklin Titus, – THE HOLLOW EARTH, 1904

Leslie, John (1766-1812) – THE NATURAL PHILOSOPHY.

Lloyd, John Uri – ETIDORHPA, OR THE END OF THE EARTH, 1896. 

Lyon, William F. & M.L. Sherman.  – THE HOLLOW GLOBE, OR THE WORLD’S AGITATOR AND RECONCILER, 1968.

Mather, Cotton (1663-1728) – Articles in the CHRISTIAN PHILOSOPHER. 

Palmer, Raymond A. (1910-1977) – An editor of AMAZING STORIES, SEARCH and FLYING SAUCERS magazines, he both wrote and published a great body of material about the “Shaver Mystery” and the “Hollow Earth“.

Reed, William – PHANTOM OF THE POLES, 1906 

Symmes, John Cleves – Writings on the Hollow Earth, or the Symmes Theory of

Concentric Spheres, by the author, his son, Maricus V. Symmes; and James McSride, between 1826-1878.

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Related:  A Guide to the Inner Earth: K

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