Columbia subject headings:
Conflict of laws--Mining law.
Conflict of laws--Petroleum law and legislation.
Conflict of laws.
Developing countries--Concessions.
Developing countries--Government ownership.
Harvard subject headings:
Concessions--Developing countries.
Conflict of laws--Eminent domain.
Conflict of laws--Mining law.
Conflict of laws--Petroleum law and legislation.
Government ownership--Law and legislation--Developing countries.
Princeton subject headings: