Columbia subject headings:
Achaemenid dynasty, 559 B.C.-330 B.C.
Iran--History--To 640.
Harvard subject headings:
Achaemenid dynasty, 559-330 B. C.
Iran--History--To 640 A.D.
Princeton subject headings:
Achaemenid dynasty, 559-330 B.C.
Iran--History--To 640.