Columbia subject headings:
Ethics--Greece--History--Congresses.
Political science--Philosophy--History--Congresses.
Harvard subject headings:
Ethics, Ancient--Congresses.
Ethics--Greece--History--Congresses.
Political ethics--Greece--History--Congresses.
Political science--Greece--History--Congresses.
Princeton subject headings:
Ethics--Greece--History--Congresses.
Political science--Philosophy--History--Congresses.