Columbia subject headings:
Harvard subject headings:
Catalonia (Spain)--Commerce--Congresses.
Catalonia (Spain)--History--Congresses.
Liguria (Italy)--Commerce--Congresses.
Liguria (Italy)--History--Congresses.
Princeton subject headings:
Catalonia (Spain)--Commerce--Congresses.
Catalonia (Spain)--History--Congresses.
Liguria (Italy)--Commerce--Congresses.
Liguria (Italy)--History--Congresses.