Columbia subject headings:
Plato--Political and social views--Congresses.
Platonists--Congresses.
Political science--Philosophy--Congresses.
Harvard subject headings:
Plato--Political and social views--Congresses.
Platonists--Congresses.
Political science--Philosophy--Congresses
Princeton subject headings:
Plato--Political and social views--Congresses.
Platonists--Congresses.
Political science--Philsophy--Congresses.