Columbia subject headings:
Harvard subject headings:
Central America--Economic conditions--1979-
Central America--Foreign relations--United States.
Central America--Social conditions--1979-
United States--Foreign relations--1981-1989.
United States--Foreign relations--1989-
United States--Foreign relations--Central America.
Princeton subject headings:
Central America--Economic conditions--1979-
Central America--Foreign relations--United States.
Central America--Social conditions--1979-
United States--Foreign relations--1981- .
United States--Foreign relations--Central America.