Columbia subject headings:
Basques--History.
Pyrenees--Description and travel.
Pyrenees--History.
Pyrenees--Social conditions.
Harvard subject headings:
Pyrenees--History.
Tourism--Pyrenees.
Princeton subject headings:
Basques--History.
Pyrenees--Description and travel.
Pyrenees--History.
Pyrenees--Social conditions.