Smarandache Semigroups
W. B. Vasantha Kandasamy
Philosophical Essays
Bertrand Russell
Knowledge Representation
Ronald J. Brachman & Hector J. Levesque & Ray Reiter
Education, Free & Compulsory
Murray Newton Rothbard
An Introduction to Sustainable Development
Peter P. Rogers & Kazi F. Jalal & John A. Boyd
The Earth Chronicles Expeditions
Zecharia Sitchin
Journeys to the Mythical Past