- The Unknown Life of Jesus Christ by Nicolas Notovitch, 2009-08-08
- Unknown Magic (Daughter of Prophecy, Book 1) by Evelyn M. Byrne, 2010-06-15
- The "Unknown" Reality, Vol. 1: A Seth Book by Seth, Jane Roberts, 1997-01
- Into the Unknown: The Remarkable Life of Hans Kraus by Susan Schwartz, 2005-07-13
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- Cabeza de Vaca's Adventures in the Unknown Interior of America (Zia Book) by Alvar Nunez Cabeza De Vaca, 1983-04-01
- The Unknown Gulag: The Lost World of Stalin's Special Settlements by Lynne Viola, 2009-02-10
- Omega: The Unknown Classic by Jim Mooney, Herb Trimpe, et all 2005-12-14
- Statistics: A Guide to the Unknown by Roxy Peck, George Casella, et all 2005-03-28
- Ethiopia, the Unknown Land: A Cultural and Historical Guide by Stuart Munro-Hay, 2002-05-03
- An Unknown Woman
- The Kneeling Christian by An Unknown Christian, 2010-05-23
- The Unknown Terrorist: A Novel by Richard Flanagan, 2008-01-21
- A Galaxy Unknown (A Galaxy Unknown - Book 1) by Thomas DePrima, 2010-06-04
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