Columbia subject headings:
Italy--Population--History--18th century.
Italy--Population--History--19th century.
Harvard subject headings:
Demography--Italy--History.
Italy--Population--History.
Overpopulation.
Population--Italy--History--18th century.
Population--Italy--History--19th century.
Princeton subject headings:
Population--Italy--History--18th century.
Population--Italy--History--19th century.