- Inner Earth
- Secrets of the Subterranean Cities
- Secrets of the Subterranean Cities 1
- Secrets of the Subterranean Cities 2
- Secrets of the Subterranean Cities 3
- Secrets of the Subterranean Cities 4
- Hollow or Inner Earth
- 1947: Admiral Richard B. Byrd's Secret Diary
- 1983: THE HOLLOW EARTH: A MADDENING THEORY THAT CAN'T BE DISPROVED
- 1995: An Introduction to The Hollow Earth
- 1996: Dhyana Markley Speaks about the Inner Earth
- 1997: Mysteries under Moscow
- A Prophecy from the Inner Earth?
- Aryan Invasion Revised
- Aurora Australis Marks The Southern Orifice
- Hollow Earth
- Hollow Earth Cities
- Icebergs from the Inner Earth
- Inner Earth Schematic
- Is Earth's Inner Sun the missing Twelfth Planet?
- Lazeria Map Collection: Is the Earth Hollow?
- Our Earth IS Hollow! -- The Scientific Evidence
- Symmes' Hole near the North Pole.
- The Cook Society & Hollow Planets
- The Hollow Earth
- The Hollow Earth - Heaven or Hell?
- THE HOLLOW EARTH - In The Inner Earth
- The Inner Sun: A Scientific Look
- THE MYSTERIOUS MOON-SHAFT
- The Pied Piper of Hamelin
- The Subterranean Origin of the Flying Saucers
- Theory into Fact: Gravity, Magnetic Poles & Ringing Bells
- United States Patent 1096102: The Hollow Earth Theory
- Mysteries of the Inner Earth
- 2001: Mysteries of the Inner Earth 1
- 2001: Mysteries of the Inner Earth 2
- 2001: Mysteries of the Inner Earth 3
- 2001: Mysteries of the Inner Earth 4
- THE SMOKY GOD
- Underground Civilizations
- 1932: Ancient Civilization Beneath Death Valley?
- 1955: The Green Children of Wolfpitte
- 1997: Underground Bases Of The Star Gods & The Controversial Shaver Mystery
- 2000: Ancient Underground World - Finally Revealed!
- 2002: Beneath Egypt's Desert Lie Ancient Seaports
- 2006: THE HOUSE AT 475 FELL ST.
- 2006: The Quest For The Metal Library
- 2008: Oddball links area to lost city
- 2009: The High Tech Underground City of Marconi, Fulcanelli, and Tesla
- Aliens live on Earth, under the ground
- American Indian Underground Origins
- Ancient and Hollow Astronauts
- Apache Underground!
- HANDBOOKS OF ARCHAEOLOGICAL HISTORY: The Tewa
- Hollow Earth in the Puranas
- Study of the Ancient Subterranean World
- Subterranean Cities
- The Almas of Central Asia
- THE MYSTERY OF THE TUNNELS OF SOUTH AMERICA
- The Subterranean Kingdom of Agharti - Hollow Earth - Tunnels - horrifying Predictions
- The UFO Underground: Breakaway Civilizations and Inner Earth Mysteries
- Underground Civilizations
- The Cave of the Ancients
- 1963: The Cave of the Ancients - Summary
- 1963: The Cave of the Ancients - Summary 2
- 1963: The Cave of the Ancients - Summary 3
- 1963: The Cave of the Ancients - Summary 4
- 1963: The Cave of the Ancients - Summary 5
- 1963: The Cave of the Ancients 1
- 1963: The Cave of the Ancients 10
- 1963: The Cave of the Ancients 11
- 1963: The Cave of the Ancients 12
- 1963: The Cave of the Ancients 13
- 1963: The Cave of the Ancients 14
- 1963: The Cave of the Ancients 2
- 1963: The Cave of the Ancients 3
- 1963: The Cave of the Ancients 4
- 1963: The Cave of the Ancients 5
- 1963: The Cave of the Ancients 6
- 1963: The Cave of the Ancients 7
- 1963: The Cave of the Ancients 8
- 1963: The Cave of the Ancients 9
- Secrets of the Subterranean Cities
- Secrets of the Subterranean Cities 1
- Secrets of the Subterranean Cities 2
- Secrets of the Subterranean Cities 3
- Secrets of the Subterranean Cities 4
- Hollow or Inner Earth
- 1947: Admiral Richard B. Byrd's Secret Diary
- 1983: THE HOLLOW EARTH: A MADDENING THEORY THAT CAN'T BE DISPROVED
- 1995: An Introduction to The Hollow Earth
- 1996: Dhyana Markley Speaks about the Inner Earth
- 1997: Mysteries under Moscow
- A Prophecy from the Inner Earth?
- Aryan Invasion Revised
- Aurora Australis Marks The Southern Orifice
- Hollow Earth
- Hollow Earth Cities
- Icebergs from the Inner Earth
- Inner Earth Schematic
- Is Earth's Inner Sun the missing Twelfth Planet?
- Lazeria Map Collection: Is the Earth Hollow?
- Our Earth IS Hollow! -- The Scientific Evidence
- Symmes' Hole near the North Pole.
- The Cook Society & Hollow Planets
- The Hollow Earth
- The Hollow Earth - Heaven or Hell?
- THE HOLLOW EARTH - In The Inner Earth
- The Inner Sun: A Scientific Look
- THE MYSTERIOUS MOON-SHAFT
- The Pied Piper of Hamelin
- The Subterranean Origin of the Flying Saucers
- Theory into Fact: Gravity, Magnetic Poles & Ringing Bells
- United States Patent 1096102: The Hollow Earth Theory
- Mysteries of the Inner Earth
- 2001: Mysteries of the Inner Earth 1
- 2001: Mysteries of the Inner Earth 2
- 2001: Mysteries of the Inner Earth 3
- 2001: Mysteries of the Inner Earth 4
- THE SMOKY GOD
- 1932: Ancient Civilization Beneath Death Valley?
- 1955: The Green Children of Wolfpitte
- 1997: Underground Bases Of The Star Gods & The Controversial Shaver Mystery
- 2000: Ancient Underground World - Finally Revealed!
- 2002: Beneath Egypt's Desert Lie Ancient Seaports
- 2006: THE HOUSE AT 475 FELL ST.
- 2006: The Quest For The Metal Library
- 2008: Oddball links area to lost city
- 2009: The High Tech Underground City of Marconi, Fulcanelli, and Tesla
- Aliens live on Earth, under the ground
- American Indian Underground Origins
- Ancient and Hollow Astronauts
- Apache Underground!
- HANDBOOKS OF ARCHAEOLOGICAL HISTORY: The Tewa
- Hollow Earth in the Puranas
- Study of the Ancient Subterranean World
- Subterranean Cities
- The Almas of Central Asia
- THE MYSTERY OF THE TUNNELS OF SOUTH AMERICA
- The Subterranean Kingdom of Agharti - Hollow Earth - Tunnels - horrifying Predictions
- The UFO Underground: Breakaway Civilizations and Inner Earth Mysteries
- Underground Civilizations
- 1963: The Cave of the Ancients - Summary
- 1963: The Cave of the Ancients - Summary 2
- 1963: The Cave of the Ancients - Summary 3
- 1963: The Cave of the Ancients - Summary 4
- 1963: The Cave of the Ancients - Summary 5
- 1963: The Cave of the Ancients 1
- 1963: The Cave of the Ancients 10
- 1963: The Cave of the Ancients 11
- 1963: The Cave of the Ancients 12
- 1963: The Cave of the Ancients 13
- 1963: The Cave of the Ancients 14
- 1963: The Cave of the Ancients 2
- 1963: The Cave of the Ancients 3
- 1963: The Cave of the Ancients 4
- 1963: The Cave of the Ancients 5
- 1963: The Cave of the Ancients 6
- 1963: The Cave of the Ancients 7
- 1963: The Cave of the Ancients 8
- 1963: The Cave of the Ancients 9