Columbia subject headings:
Costa Rica--Relations--Mexico.
Mexico--Relations--Costa Rica.
Harvard subject headings:
Costa Rica--Relations--Mexico.
Mexico--Relations--Costa Rica.
Princeton subject headings:
Central America--Foreign relations--1979-
Central America--Politics and government--1979-
Costa Rica--Foreign relations.
Costa Rica--Relations--Mexico.
Mexico--Foreign relations--1970-1988.
Mexico--Relations--Costa Rica.