• 

  Etidorhpa: The Publisher's Edition: 1901

  by John Uri Loyd

• 

  Hollow Globe

  by M. L. Sherman & William F. Lyon

• 

  Are the Planets Inhabited?

  by E. Walter Maunder

• 

  Hollow Planets

  by Jan Lamprecht

• 

  Incredible Cities of the Inner Earth

  David H. Lewis

• 

  Inner Earth People - Outer Space People

  William L. Blessing

• 

  Inner World

  Frederick Culmer Sr.

• 

  Missing Diary of Admiral Richard E. Byrd

  Richard E. Byrd

• 

  Cellular Cosmogony

  Koresh Cyrus Reed Teed

• 

  Description of Satan's Court

  Robert Boyle

• 

  Earthquake and Fire

  Charles Morris

• 

  Holy Earth

  L. H. Bailey

• 

  In Northern Mists

  Fridtjof Nansen, Arthur G. Chater

• 

  Mazes and Labyrinths

  W.H. Matthews

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