Columbia subject headings:
Harvard subject headings:
Cities and towns--Europe--History--Congresses
Europe--History--1517-1648--Congresses.
Social classes--Europe--History--Congresses.
Social groups--Europe--History--Congresses.
Princeton subject headings:
Cities and towns--Europe--History--Congresses.
Europe--History--1517-1648--Congresses.
Social classes--Europe--History--Congresses.
Social groups--Europe--History--Congresses.