Mysteries of the Unknown
(Time-Life, 1987-1991)
Mysteries of the Unknown is a series of books about the paranormal, published by Time-Life Books from 1987 through 1991. Each book focused on a different topic, such as ghosts, UFOs, psychic powers and dreams. The idea for the series was conceived following the popularity of the publisher's previous Enchanted World book series, and was followed with a companion series, Collector's Library of the Unknown, from 1991 through 1993. The books broke the sales record for the company.
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