- Phantom Encounters (Mysteries of the Unknown) by Time-Life Books, 1995-05
- The Unknown Prophet by Delbert W. Baker, 1987-08
- Clouds Thick, Whereabouts Unknown: Poems by Zen Monks of China (Translations from the Asian Classics)
- The Book of the Unknown: Tales of the Thirty-six by Jonathon Keats, 2009-02-10
- Sender Unknown by Sallie Lowenstein, 2006
- The Unknown Masterpiece: (Le Chef-d'oeuvre inconnu) by Honoré de Balzac, 2010-01-12
- Unknown Mexico, Volume 1 (of 2) - A Record of Five Years' Exploration Among the Tribes of the Western Sierra Madre; In the Tierra Caliente of Tepic and Jalisco; and Among the Tarascos of Michoacan by Carl Lumholtz, 2010-07-12
- Mysteries of the Unknown by Time-Life Books, 2006
- Of Unknown Origin: A Memoir by Debra Levi Holtz, 2001-05-01
- Unknown Quantity by Paul Virilio, 2003-05
- Charting the Unknown: Family, Fear, and One Long Boat Ride by Kim Petersen, 2010-07-15
- Mystic Quests (Mysteries of the Unknown) by Time-Life Books, 1995-05
- The Unknown Soldiers by Arthur E. Barbeau, Florette Henri, et all 1996-03-22
- Exploring the Physics of the Unknown Universe: An Adventurer's Guide by Milo Wolff, 1991
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