Columbia subject headings:
Harvard subject headings:
Books--Europe--History--400-1400--Congresses.
Books--Europe--History--400-1450--Congresses.
Books--History--1450-1600--Congresses.
Books--History--400-1450--Congresses.
Civilization, Medieval--Congresses
Literacy--Europe--History--To 1500--Congresses.
Manuscripts, Medieval--Congresses.
Princeton subject headings:
Books--History--400-1450--Congresses.
Civilization, Medieval--Congresses.
Manuscripts, Medieval--Congresses.