Columbia subject headings:
Normandy (France)--Commerce--History--Congresses.
Normandy (France)--Economic conditions--Congresses.
Normandy (France)--Foreign economic relations--Congresses.
Normandy (France)--Social conditions--Congresses.
Harvard subject headings:
Industries--France--Normandy--History.
Normandy (France)--Commerce--History--Congresses.
Normandy (France)--Economic conditions--Congresses.
Normandy (France)--Foreign economic relations--Congresses.
Normandy (France)--Social conditions--Congresses.
Princeton subject headings: