Columbia subject headings:
Harvard subject headings:
Demography--Economic aspects--Congresses.
Demography--Scandinavia--Congresses.
Scandinavia--Population--Congresses.
Welfare state--Congresses.
Princeton subject headings:
Demography--Economic aspects--Congresses.
Demography--Scandinavia--Congresses.
Scandinavia--Population--Congresses.
Welfare state--Congresses.