Columbia subject headings:
Harvard subject headings:
Feudalism--Syria--Congresses.
Middle East--History--To 622.
Seleucids
Seleucids--Congresses.
Syria--Civilization--Congresses.
Syria--History--333 B.C.-634 A.D.
Syria--History--To 333 B.C.--Congresses.
Princeton subject headings:
Feudalism--Syria--Congresses.
Seleucids--Congresses.
Syria--Civilization--Congresses.
Syria--History--To 333 B.C.--Congresses.