Columbia subject headings:
Harvard subject headings:
Bedouins--Iraq--History.
Bedouins--Syria--History.
Iraq--History--634-1534.
Iraq--History--To 634.
Nomads--Iraq--History.
Nomads--Syria--History.
Syria--History--333 B.C.-634 A.D.
Syria--History--634-750.
Syria--History--750-1260.
Princeton subject headings:
Bedouins--Iraq--History.
Bedouins--Syria--History.
Iraq--History--634-1534.
Iraq--History--To 634.
Nomads--Iraq--History.
Nomads--Syria--History.
Syria--History--333 B.C.-634 A.D.
Syria--History--634-750.
Syria--History--750-1260.