System Requirment: Adobe Acrobat Reader. This DVD-ROM Includes Scanned Files from Book of "The camel and the wheel" written by Richard W. Bulliet. the Book's Contents as Follow: The Camel and the Wheel, The Origun of Camel Domestication, The Speard of Camel Domestication and the Incense Trade, The North Arabian Saddle and the Rise of Arabs, The Camel in North Africa, Iran: one Hump or Two, The Camel as a Draft Animal, A Society Without Wheels, if Camels are Such a Good Idea, The Return of the Wheel and the Future of the Camel.