Columbia subject headings:
Books--Great Britain--History--Congresses.
Great Britain--Civilization--1066-1485--Congresses.
Great Britain--History--Lancaster and York, 1399-1485--Congresses.
Harvard subject headings:
Books--Great Britain--History--Congresses.
England--Civilization--1066-1485--Congresses.
Great Britain--Civilization--1066-1485--Congresses.
Great Britain--History--Lancaster and York, 1399-1485--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
England--Civilization--1066-1485--Congresses.
Fifteenth century--Congresses.
Great Britain--History--Lancaster and York, 1399-1485--Congresses.