Columbia subject headings:
Harvard subject headings:
Elsa River Valley (Italy)--Politics and government.
Elsa River Valley (Italy)--Social conditions.
Elsa River Valley (Italy)--Social life and customs.
Princeton subject headings:
Elsa River Valley (Italy)--Politics and government.
Elsa River Valley (Italy)--Social conditions.
Elsa River Valley (Italy)--Social life and customs.