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Mysteries of the Unknown

The Mysteries of the Unknown book series by multiple authors includes books The UFO Phenomenon, Witches and Witchcraft (Mysteries of the Unknown Series), Hauntings, and several more. See the complete Mysteries of the Unknown series book list in order, box sets or omnibus editions, and companion titles.
34 Books
The UFO Phenomenon - Book  of the Mysteries of the Unknown

The UFO Phenomenon

Time-Life Books
From $4.29
Hauntings - Book  of the Mysteries of the Unknown

Hauntings

Time-Life Books
From $4.19
Mysterious Creatures - Book  of the Mysteries of the Unknown

Mysterious Creatures

Time-Life Books, Editors Of Time-Life Books
From $5.29
Secrets of the Alchemists - Book  of the Mysteries of the Unknown

Secrets of the Alchemists

Time-Life Books
From $7.69
Magical Arts - Book  of the Mysteries of the Unknown

Magical Arts

Time-Life Books, Anonymous
From $5.69
Psychic Powers - Book  of the Mysteries of the Unknown

Psychic Powers

Time-Life Books
From $4.49
Spirit Summonings - Book  of the Mysteries of the Unknown

Spirit Summonings

Time-Life Books
From $5.09
Ancient Wisdom and Secret Sects - Book  of the Mysteries of the Unknown

Ancient Wisdom and Secret Sects

Time-Life Books
From $6.09
Phantom Encounters - Book  of the Mysteries of the Unknown

Phantom Encounters

Time-Life Books, Janet P. Cave
From $4.49
Mind over Matter - Book  of the Mysteries of the Unknown

Mind over Matter

Time-Life Books
From $5.49
Mystical Year - Book  of the Mysteries of the Unknown

Mystical Year

Time-Life Books
From $5.09
Eastern Mysteries - Book  of the Mysteries of the Unknown

Eastern Mysteries

Time-Life Books
From $5.99
Earth Energies - Book  of the Mysteries of the Unknown

Earth Energies

From $6.09
Cosmic Duality - Book  of the Mysteries of the Unknown

Cosmic Duality

Time-Life Books
From $5.69
Visions and Prophecies - Book  of the Mysteries of the Unknown

Visions and Prophecies

Time-Life Books, Time Life
From $4.49
Dreams and Dreaming - Book  of the Mysteries of the Unknown

Dreams and Dreaming

Time-Life Books
From $5.39
Mystic Places - Book  of the Mysteries of the Unknown

Mystic Places

Time-Life Books
From $3.86
Alien Encounters - Book  of the Mysteries of the Unknown

Alien Encounters

Time-Life Books
From $12.69
Mystic Quests - Book  of the Mysteries of the Unknown

Mystic Quests

Time-Life Books
From $7.39
Psychic Voyages - Book  of the Mysteries of the Unknown

Psychic Voyages

Time-Life Books
From $3.89
Transformations - Book  of the Mysteries of the Unknown

Transformations

Time-Life Books
From $4.19
Mysterious World - Book  of the Mysteries of the Unknown

Mysterious World

Time-Life Books
From $8.19
Mysteries of the Unknown - Book  of the Mysteries of the Unknown

Mysteries of the Unknown

Time-Life Books
From $4.99
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