Columbia subject headings:
Civilization, Ancient--Congresses.
Economic history--To 500--Congresses.
International law--Congresses.
Harvard subject headings:
Civilization, Ancient--Congresses
Economic history--To 500--Congresses.
International law--Congresses.
Princeton subject headings:
Acculturation--Congresses.
Civilization, Ancient--Congresses.
Economic history--To 500--Congresses.