Columbia subject headings:
Cities and towns in art--Europe--Congresses.
City planning--Europe--Congresses.
Harvard subject headings:
Cartography--Europe--History--Congresses.
Cartography--History
Cities and towns in art
Cities and towns--Europe--History--Congresses
Cities and towns--Maps--Early works to 1800.
Cities and towns--Pictorial works--Congresses.
Europe--Views--Congresses.
Princeton subject headings:
Cartography--Europe--History--Congresses.
Cities and towns--Europe--History--Congresses.
Cities and towns--Pictorial works--Congresses.
Europe--Views--Congresses.