- The Unknown Sayings of Jesus by Marvin Meyer, 2005-09-13
- Into the Unknown: Leadership Lessons from Lewis & Clark's Daring Westward Expedition by Jack Uldrich, 2004-04-23
- Message from an Unknown Chinese Mother: Stories of Loss and Love by Xinran, 2011-03-08
- Points Unknown: The Greatest Adventure Writing of the Twentieth Century (Outside Books)
- The Known, the Unknown, and the Unknowable in Financial Risk Management: Measurement and Theory Advancing Practice
- The Unknown Ajax by Georgette Heyer, 2005-01-01
- Gifts of Unknown Things: A True Story of Nature, Healing, and Initiation from Indonesia's Dancing Island by Lyall Watson, 1991-12-01
- The Unknown Errors of Our Lives: Stories by Chitra Banerjee Divakaruni, 2002-01-15
- Managing the Unknown: A New Approach to Managing High Uncertainty and Risk in Projects by Christoph H. Loch, Arnoud DeMeyer, et all 2006-03-10
- Hymns to an Unknown God: Awakening The Spirit In Everyday Life by Sam Keen, 1995-09-01
- The Unknown She: Eight Faces of an Emerging Consciousness by Hilary Hart, 2003-03-01
- Man The Unknown by Alexis Carrel, 1935
- The Unknown God: W.T. Smith and the Thelemites by Martin P. Starr, 2003-11
- The Autobiography of an Unknown Indian (New York Review Books Classics) by Nirad C. Chaudhuri, 2001-10-10
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