Columbia subject headings:
Harvard subject headings:
Concessions--Government policy--Great Britain.
Energy policy--Great Britain
Offshore oil well drilling--North Sea.
Oil and gas leases--Government policy--Great Britain.
Petroleum industry and trade--Government policy--Great Britain.
Petroleum industry and trade--North Sea.
Princeton subject headings:
Concessions--Government policy--Great Britain.
Oil and gas leases--Government policy--Great Britain.
Petroleum industry and trade--Government policy--Great Britain.