Columbia subject headings:
Brazil--Foreign relations.
Colombia--Boundaries.
Colombia--Foreign relations.
Costa Rica--Foreign relations.
Ecuador--Foreign relations.
Nicaragua--Foreign relations.
Panama--Foreign relations.
Venezuela--Foreign relations.
Harvard subject headings:
Brazil--Foreign relations--History.
Colombia--Foreign relations--History.
Costa Rica--Foreign relations--History.
Ecuador--Foreign relations--History.
Nicaragua--Foreign relations--History.
Panama--Foreign relations--History.
Venezuela--Foreign relations--History.
Princeton subject headings:
Brazil--Foreign relations--History.
Colombia--Foreign relations--History.
Costa Rica--Foreign relations--History.
Ecuador--Foreign relations--History.
Nicaragua--Foreign relations--History.
Panama--Foreign relations--History.
Venezuela--Foreign relations--History.