Columbia subject headings:
Civilization, Medieval--Congresses.
East and West--Congresses.
Harvard subject headings:
Arts, Medieval--Congresses.
Civilization, Medieval--Congresses
East and West--Congresses
Music--500-1400--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
East and West--Congresses.
Music--500-1400--Congresses.