Columbia subject headings:
Classical drama--History and criticism--Congresses.
Theater--Greece--History--To 500--Congresses.
Theater--History--To 500--Congresses.
Theater--Rome--Congresses.
Harvard subject headings:
Classical drama--History and criticism--Congresses.
Theater--Greece--History--To 500--Congresses.
Theater--History--To 500--Congresses.
Theater--Rome--Congresses.
Princeton subject headings:
Greek drama--History and criticism--Congresses.
Theater--Greece--History--To 500--Congresses.
Theater--Rome--Congresses.