Columbia subject headings:
Civilization, Ancient--Congresses.
Language and languages--Political aspects--Congresses.
Power (Social sciences)--Congresses.
Harvard subject headings:
Civilization, Ancient--Congresses
Language and languages--Political aspects--Congresses
Power (Social sciences)--Congresses
Princeton subject headings:
Civilization, Ancient.
Language and languages--Political aspects--Congresses.
Power (Social sciences)--Congresses.