Columbia subject headings:
Charters--History--To 1500--Congresses.
Civilization, Medieval--Congresses.
Literacy--Europe--History--To 1500--Congresses.
Written communication--Europe--History--Sources--Congresses.
Written communication--Europe--History--To 1500--Congresses.
Harvard subject headings:
Charters--History--To 1500--Congresses.
Civilization, Medieval--Congresses
Diplomatics--Europe--Congresses.
Literacy--Europe--History--To 1500--Congresses.
Written communication--Europe--History--Sources--Congresses.
Written communication--Europe--History--To 1500--Congresses.
Princeton subject headings:
Charters--History--To 1500--Congresses.
Civilization, Medieval.
Literacy--Europe--History--To 1500--Congresses.
Written communication--Europe--History--Sources--Congresses.
Written communication--Europe--History--To 1500--Congresses.