Columbia subject headings:
Greece--History--Persian Wars, 500-449 B.C.
Harvard subject headings:
Greece--History--Persian Wars, 500 B.C.-449 B.C.
Greece--History--Persian Wars, 500-449 B.C.--Influence.
Iran--History--To 640.
Princeton subject headings:
Greece--History--Persian Wars, 500-449 B.C.--Influence.
Iran--History--To 640.