Columbia subject headings:
Demography--Italy--History--Congresses.
Italy--Population--History--Congresses.
Harvard subject headings:
Demography--Italy--History--15th century--Congresses.
Demography--Italy--History--16th century--Congresses.
Italy--Population--History--15th century--Congresses.
Italy--Population--History--16th century--Congresses.
Princeton subject headings:
Demography--Italy--History--Congresses.
Italy--Population--History--Congresses.