Columbia subject headings:
Pyrenees Region--History.
Pyrenees Region--Social conditions.
Pyrenees--History.
Pyrenees--Social conditions.
Harvard subject headings:
Pyrenees Region--History.
Pyrenees Region--Social conditions.
Pyrenees--History.
Pyrenees--Social conditions.
Princeton subject headings:
Pyrenees Region--History--Congresses.
Pyrenees Region--Social conditions--Congresses.
Pyrenees--History--Congresses.
Pyrenees--Social conditions--Congresses.