Columbia subject headings:
Civilization, Medieval--Congresses.
Civilization, Medieval--Historiography--Congresses.
History--Errors, inventions, etc.--Congresses.
Middle Ages--Congresses.
Middle Ages--Historiography--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Middle Ages--Congresses
Middle Ages--Historiography--Congresses
Princeton subject headings:
Civilization, Medieval--Congresses.
Civilization, Medieval--Historiography--Congresses.
History--Errors, inventions, etc.--Congresses.
Middle Ages--Congresses.
Middle Ages--Historiography--Congresses.