Columbia subject headings:
Harvard subject headings:
Gas industry--Government policy--Great Britain.
Great Britain--Economic policy--1945-1964.
Petroleum industry and trade--Government policy--Great Britain.
Princeton subject headings:
Gas industry--Government policy--Great Britain.
Great Britain--Economic policy--1964-1979.
Great Britain--Economic policy--1979-1997.
Petroleum industry and trade--Government policy--Great Britain.