Columbia subject headings:
Economics--Congresses.
Progress--Congresses.
Quality of life--Congresses.
Welfare state--Congresses.
Harvard subject headings:
Economics--Congresses
Progress--Congresses
Quality of life--Congresses
Welfare state--Congresses.
Princeton subject headings:
Economics--Congresses.
Progress--Congresses.
Quality of life--Congresses.
Welfare state--Congresses.