Columbia subject headings:
Central America--Foreign relations--Mexico--Sources.
Mexico--Foreign relations--1970-1988--Sources.
Mexico--Foreign relations--Central America--Sources.
Harvard subject headings:
Central America--Foreign relations--1970---Sources.
Central America--Relations--Mexico--Sources.
Mexico--Foreign relations--1970-1988--Sources.
Mexico--Relations--Central America--Sources.
Princeton subject headings:
Central America--Foreign relations--Mexico--Sources.
Mexico--Foreign relations--1970-1988--Sources.
Mexico--Foreign relations--Central America--Sources.