Columbia subject headings:
Chronology, Historical--Congresses.
Europe--Antiquities--Chronology--Congresses.
Europe--History--476-1492--Chronology--Congresses.
Middle Ages--Chronology--Congresses.
Harvard subject headings:
Chronology, Historical--Congresses.
Europe--Antiquities--Congresses.
Europe--History--476-1492--Chronology--Congresses.
Middle Ages--Chronology--Congresses.
Princeton subject headings:
Chronology, Historical--Congresses.
Europe--Antiquities--Congresses.
Europe--History--476-1492--Chronology--Congresses.
Middle Ages--History--Chronology--Congresses.