12 books in series
Collector's Library of the Unknown
Collector's Library of the Unknown is a 12-book series with 12 released primary works first released in 1882 with contributions by Ignatius L. Donnelly, Sylvan Muldoon, Upton Sinclair, Harry Price, John G. Fuller, Harry Houdini, and J. Allen Hynek.
 Atlantis : the antediluvian world
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 The Projection of the Astral Body The Projection of the Astral Body
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 The Most Haunted House in England The Most Haunted House in England: Ten Years' Investigation of Borley Rectory
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 Atlantis: The Antediluvian World
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 The Interrupted Journey
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 Mental Radio
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 The Interrupted Journey: Two Lost Hours Aboard a UFO: The Abduction of Betty and Barney Hill
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 The UFO Experience: A Scientific Inquiry
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 Atlantis the Antediluvian World
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 Houdini: A Magician Among the Spirits
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 A Magician Among the Spirits
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 A Magician Among the Spirits A Magician Among the Spirits: Unveiling the Illusions: Houdini's Battle Against Fraudulent Mediums and the Supernatural
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