- Pedra da Gāvea
- Sezione Hollow Earth del sito SPIRITWEB.ORG
- Sezione Hollow Earth del sito UFOMIND.COM
- Sezione Underground Civilization del sito CRYSTALINKS.COM
- THE SMOKY GOD di Willis George Emerson
- HOLLOW EARTH di Raimond Bernard
- About Admiral Richard Byrd
- UFOMIND - Dennis Crenshaw
- UFOMIND - Hollow Earth
- Some description of Elves
- The Hollow Earth : Forewords ----- di Raimond Bernard
- The Hollow Earth Theory
- Admiral Byrd's Epoch-Making Discovery ---- di Raimond Bernard
- The Hollow Earth - Chapter 2 ---- di Raimond Bernard
- Hollow Earth -William Reed's Book, "Phantom of the Poles"- di Raimond Bernard
- Marshall B. Gardner's Book, " A Journey to the Earth's Interior Or Have the Poles Re
- The Hollow Earth - The Unnatural Museum
- Yahoo --- Hollow Earth
- UFOMIND : Cyrus Teed
- NEW CLUES: IS THE EARTH HOLLOW?
- HOLLOW PLANET
- The Hollow Earth - Fact or Fiction
- UNITED STATES PATENT 1096102: THE HOLLOW EARTH THEORY
- The Hollow Earth - A study of the Word within our own
- Sites
- Aquarian Age
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