Columbia subject headings:
Policy sciences--Economic aspects--Congresses.
Political planning--Economic aspects--Congresses.
Harvard subject headings:
Economics--Congresses
Industries--Self-regulation--Congresses.
Policy sciences--Congresses.
Policy sciences--Economic aspects--Congresses.
Political planning--Economic aspects--Congresses.
Pressure groups--Congresses.
Princeton subject headings:
Policy sciences--Economic aspects--Congresses.
Political planning--Economic aspects--Congresses.