A category dedicated for respectful debates.
| Author | Title | Publication Details | Year | Call Number |
|---|---|---|---|---|
| [McBride, James] | Symmes’s theory of concentric spheres | Cincinnati, Morgan, Lodge and Fisher | 1826 | QB638.S9727 Rare Bk. Coll. |
| Mitchell, Alexander | A treatise on natural philosophy, in vindication of Symmes’s theory | Eaton, Printed by S. Tizzard | 1826 | QB638.S974 Rare Bk. Coll. |
| Reynolds, Jeremiah N. | Remarks on a review of Symmes’ theory | Washington, Printed by Gales & Seaton | 1827 | QB638.S975 Rare Bk. Coll. |
| Symmes, John C. | The Symmes theory of concentric spheres | Louisville, Ky., Bradley & Gilbert | 1878 [1885] | QB638.S97 Rare Bk. Coll. |
| Culmer, Frederick | The inner world | Salt Lake City, Utah | 1886 | QB638.C96 |
| Gardner, Marshall B. | A journey to the earth’s interior | Aurora, Ill. | 1913 | QB638.G3 |
| Gardner, Marshall B. | A journey to the earth’s interior (Revised and Enlarged) | Aurora, Ill. | 1920 | QB638.G3 1920 |
| Kenton, Edna | The book of earths | New York, W. Morrow | 1928 | QB631.K45 |
| Neupert, Karl | Welt-Wendung! Inversion of the universe | Augsburg | 1924 | DN-Ob |
| Neupert, Karl | Umwälzung! Das Weltbild der Zukunft | Augsburg | 1927 | 4QB-77 |
| Neupert, Karl | Umsturz des Welt-Alls | Memmingen | 1929 | MLCS 87/4094 (Q) |
| De Camp, Lyon Sprague, and Willy Ley | Lands beyond | New York, Rinehart | 1952 | G100.D4 |
| Gardner, Martin | Fads and fallacies in the name of science | New York, Dover Publications | 1957 | Q173.G35 1957 |
| Wallace, Irving | The square pegs | New York, A. A. Knopf | 1957 | CT9990.W3 |
| Ley, Willy | For your information: the hollow earth | Galaxy science fiction | 1956 | PZ1.A1G3, v. 11 |
| Moore, Patrick | Can you speak Venusian? | Newton Abbot, David & Charles | 1972 | QB52.M66 1972 |
| Cohen, Daniel | Is the earth flat or hollow? | Science digest | 1972 | Q1.S383, v. 72 |
| Smith, Warren | This hollow earth | London, Sphere Books | 1997 | QE509.S63 1997 |
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