Columbia subject headings:
Harvard subject headings:
Aragon (Spain)--Civilization--Congresses.
Aragon (Spain)--History--Congresses.
Aragon (Spain)--Relations--Spain--Catalonia--Congresses.
Catalonia (Spain)--Civilization--Congresses.
Catalonia (Spain)--History--Congresses.
Catalonia (Spain)--Relations--Spain--Aragón--Congresses.
Princeton subject headings:
Aragon (Spain)--Civilization--Congresses.
Aragon (Spain)--History--Congresses.
Aragon (Spain)--Relations--Spain--Catalonia--Congresses.
Catalonia (Spain)--Civilization--Congresses.
Catalonia (Spain)--History--Congresses.
Catalonia (Spain)--Relations--Spain--Aragon--Congresses.