- Unknown Soldier Vol. 1: Haunted House by Joshua Dysart, 2009-08-14
- Darkness Unknown (Paladins of Darkness, Book 5) by Alexis Morgan, 2009-01-27
- Unknown (The Unknown) by Mark Waid, 2010-10-12
- The Unknown Darkness: Profiling the Predators Among Us by Gregg O. Mccrary, 2004-10-01
- At the Hands of Persons Unknown: The Lynching of Black America (Modern Library Paperbacks) by Philip Dray, 2003-01-07
- Omega: The Unknown by Jonathan Lethem, 2008-09-24
- Grace Unknown: The Heart of Reformed Theology by R. C. Sproul, 1997-03
- Unknown Soldiers: The Story of the Missing of the First World War (Vintage) by Neil Hanson, 2007-05-08
- The Unknown Masterpiece by Honoré De Balzac, 2010-07-24
- The Unknown Life Of Jesus Christ by Nicolas Notovitch, 2008-12-06
- Destination Unknown (Signature editions) by Agatha Christie, 2003-04-07
- The Unknown Shore by Patrick O'Brian, 1996-10-17
- Hua Hu Ching: The Unknown Teachings of Lao Tzu by Brian Walker, 1995-09-08
- The Seduction of an Unknown Lady by Samantha James, 2008-03-25
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