Columbia subject headings:
Greece--Politics and government--Congresses.
Revolutions--Philosophy--Congresses.
Rome--Politics and government--Congresses.
Harvard subject headings:
Civilization, Greco-Roman--Congresses
Order (Philosophy)--Congresses.
Political science--Congresses
Princeton subject headings:
Civilization, Greco-Roman--Congresses.
Order (Philosophy)--Congresses.
Political science--Congresses.