Columbia subject headings:
Harvard subject headings:
Demographic transition--Europe--History--Congresses.
Europe--Social policy--Congresses.
Population aging--Europe--History--Congresses.
Social security--Europe--History--Congresses.
Princeton subject headings:
Demographic transition--Europe--History--Congresses.
Europe--Social policy--Congresses.
Population aging--Europe--History--Congresses.
Social security--Europe--History--Congresses.