Columbia subject headings:
Democracy--History--To 1500--Congresses.
Estates (Social orders)--Greece--Congresses.
History, Ancient--Congresses.
Plebs (Rome)--Congresses.
Harvard subject headings:
Democracy--History--To 1500--Congresses.
Estates (Social orders)--Greece--Congresses.
History, Ancient--Congresses
Plebs (Rome)--Congresses.
Princeton subject headings:
Democracy--History--To 1500--Congresses.
Estates (Social orders)--Greece--Congresses.
History, Ancient--Congresses.
Plebs (Rome)--Congresses.