Columbia subject headings:
Energy industries--Political aspects.
Gas industry--Political aspects.
Petroleum industry and trade--Political aspects.
Security, International.
World politics--1945-1989.
Harvard subject headings:
Energy industries--Political aspects.
Gas industry--Political aspects.
Petroleum industry and trade--Political aspects
Security, International.
World politics--1945-
World politics--1945-1989
Princeton subject headings:
Energy industries--Political aspects.
Gas industry--Political aspects.
Petroleum industry and trade--Political aspects.
Security, International.
World politics--1945-1989.