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