Columbia subject headings:
Economic policy--Congresses.
Norway--Economic policy--Congresses.
Petroleum industry and trade--Congresses.
Petroleum industry and trade--Norway--Congresses.
Harvard subject headings:
Economic policy--Congresses.
Norway--Economic policy--Congresses.
Petroleum industry and trade--Congresses
Petroleum industry and trade--Norway--Congresses.
Princeton subject headings:
Economic policy--Congresses.
Norway--Economic policy--Congresses.
Petroleum industry and trade--Congresses.
Petroleum industry and trade--Norway--Congresses.