Columbia subject headings:
Harvard subject headings:
Central America--Foreign relations--Costa Rica.
Central America--Politics and government--1979-
Costa Rica--Foreign relations--Central America.
Costa Rica--Politics and government--1986-
Princeton subject headings:
Central America--Foreign relations--Costa Rica.
Central America--Politics and government--1979-
Costa Rica--Foreign relations--Central America.
Costa Rica--Politics and government--1986-