Columbia subject headings:
Harvard subject headings:
Crises--Europe--History--To 1500--Congresses.
Social change--Europe--History--To 1500--Congresses.
Social history--Medieval, 500-1500--Congresses
Symbolism--Europe--History--Congresses.
Symbolism--Social aspects--Congresses.
Princeton subject headings:
Crises--Europe--History--To 1500--Congresses.
Social change--Europe--History--To 1500--Congresses.
Social history--Medieval, 500-1500--Congresses.
Symbolism--Europe--History--Congresses.
Symbolism--Social aspects--Congresses.