Columbia subject headings:
International relations.
Mexico--Foreign relations--1970-1988.
Nuclear-weapon-free zones--Latin America.
Harvard subject headings:
International relations
Mexico--Foreign relations--1946-
Mexico--Foreign relations--1970-1988.
Nuclear-weapon-free zones--Latin America.
Princeton subject headings:
International relations.
Mexico--Foreign relations--20th century.
Nuclear-weapon-free zones--Latin America.