Columbia subject headings:
Criminal justice, Administration of--Italy--Po River Valley--History--19th century.
Po River Valley (Italy)--Economic conditions.
Po River Valley (Italy)--Politics and government.
Po River Valley (Italy)--Social conditions.
Harvard subject headings:
Criminal justice, Administration of--Italy--Po River Valley--History--19th century.
Po River Valley (Italy)--Economic conditions.
Po River Valley (Italy)--Politics and government.
Po River Valley (Italy)--Social conditions.
Princeton subject headings:
Po River Valley (Italy)--History.