Ragnarok: The Age of Fire and Gravel

Atlantis: The Antediluvian World

Ragnarok: The Age of Fire and Gravel

The Great Cryptogram: Francis Bacon's Cipher in the So-called Shakespeare Plays, Volume 1

Caesar's Column: A Story of the Twentieth Century

Ragnarok : the Age of Fire and Gravel: Unearthing Ancient Catastrophes and Lost Civilizations

Atlantis: The Antedeluvian World: Unveiling the Mysteries of a Lost Civilization

Atlantis: The Antediluvian World

Atlantis: The Antedeluvian World

Ragnarok : the Age of Fire and Gravel

The Cipher in the Plays, and on the Tombstone

Atlantis: The Antediluvian World

The Bryan Campaign for the American People's Money

Ragnarok: The Age of Fire and Gravel

Atlantis: The Antediluvian World

The Great Cryptogram: Francis Bacon's Cipher in the So-called Shakespeare Plays

Atlantis: The Antediluvian World

The Great Cryptogram: Francis Bacon's Cipher in the So-called Shakespeare Plays, Volume 2

Cæsar's Column: A Story of the Twentieth Century

Doctor Huguet: A Novel