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

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The Most Haunted House in England

Atlantis: The Antediluvian World
The Interrupted Journey
Mental Radio
The Interrupted Journey: Two Lost Hours Aboard a UFO: The Abduction of Betty and Barney Hill
The UFO Experience: A Scientific Inquiry
Atlantis the Antediluvian World
Houdini: A Magician Among the Spirits
A Magician Among the Spirits
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A Magician Among the Spirits