Columbia subject headings:
Costa Rica--Boundaries--History.
Costa Rica--Boundaries--Nicaragua.
Costa Rica--Foreign relations--Nicaragua.
Costa Rica--History--1821-1948.
Nicaragua--Boundaries--Costa Rica.
Nicaragua--Foreign relations--Costa Rica.
Harvard subject headings:
Costa Rica--Boundaries--History.
Costa Rica--Boundaries--Nicaragua.
Costa Rica--Foreign relations--Nicaragua.
Costa Rica--History--1821-1948.
Nicaragua--Boundaries--Costa Rica.
Nicaragua--Foreign relations--Costa Rica.
Princeton subject headings:
Costa Rica--Boundaries--Nicaragua.
Nicaragua--Boundaries--Costa Rica.