Columbia subject headings:
Demographic transition--Italy--History--Congresses.
Demographic transition--Italy--History--Statistics--Congresses.
Fertility, Human--Italy--History--Congresses.
Fertility, Human--Italy--History--Statistics--Congresses.
Harvard subject headings:
Demographic transition--Italy--History--Congresses.
Demographic transition--Italy--History--Statistics--Congresses.
Fertility, Human--Italy--History--Congresses.
Fertility, Human--Italy--History--Statistics--Congresses.
Princeton subject headings:
Demographic transition--Italy--History--Congresses.
Demographic transition--Italy--History--Statistics--Congresses.
Fertility, Human--Italy--History--Congresses.
Fertility, Human--Italy--History--Statistics--Congresses.
Statistics.