Columbia subject headings:
Central America--Foreign relations--Costa Rica.
Costa Rica--Foreign relations--1948-1986.
Costa Rica--Foreign relations--Central America.
Harvard subject headings:
Central America--Foreign relations--Costa Rica.
Costa Rica--Foreign relations--1948-
Costa Rica--Foreign relations--Central America.
Princeton subject headings:
Central America--Foreign relations--Costa Rica.
Costa Rica--Foreign relations--Central America.
Intervention (International law)