Columbia subject headings:
Costa Rica--Foreign relations--United States.
United States--Foreign relations--Costa Rica.
Harvard subject headings:
Costa Rica--Foreign relations--United States.
Costa Rica--Politics and government--1821-1948.
Guatemala--Foreign relations--United States.
Guatemala--Politics and government--1945-1985
United States--Foreign relations--Costa Rica.
United States--Foreign relations--Guatemala.
Princeton subject headings:
Costa Rica--Relations--United States.
Guatemala--Relations--United States.
United States--Relations--Costa Rica.
United States--Relations--Guatemala.