"The Paleolithic men of Iraq were not isolated. Through the Syrian desert - where Stone Age artifacts have been found in various places - they were in contact with the Palaeolithic men of Syria-Palestine, and it is not by chance that the flint industries of the two countries have some features in common. They also had commercial intrcourse with the Anatolian plateau and the Iranian highlands."
George Roux, Ancient Iraq, p. 39.
(Citation for "Between the Rivers, Before the State.")