Columbia subject headings:
Pyrenees Region--Population--History.
Pyrenees Region--Statistics, Vital.
Harvard subject headings:
Pyrenees Region--Population--History.
Pyrenees Region--Statistics, Vital.
Pyrenees--Population--History.
Pyrenees--Statistics, Vital.
Princeton subject headings:
Demographic transition--Pyrenees--History.
Pyrenees--Emigration and immigration.
Pyrenees--Population.
Pyrenees--Social conditions.
Pyrenees--Social life and customs.