Columbia subject headings:
Harvard subject headings:
Central America--Foreign relations--United States.
Central America--History--1821-1951.
Central America--History--1951-
Central America--History--1951-1979.
United States--Foreign relations--Central America.
Princeton subject headings:
Central America--Foreign relations--United States.
Central America--History--1821-1951.
Central America--History--1951-1979.
Central America--History--1979-
United States--Foreign relations--Central America.