Columbia subject headings:
Petroleum industry and trade--Political aspects.
United States--Foreign relations--1945-1989.
World politics--1945-1989.
Harvard subject headings:
Petroleum industry and trade--Political aspects
United States--Foreign relations--1945-
World politics--1945-
Princeton subject headings:
Petroleum industry and trade--Political aspects.
United States--Foreign relations--1945-1989.
World politics--1945-1989.