Columbia subject headings:
Communism--El Salvador.
El Salvador--Foreign relations--United States.
El Salvador--Politics and government--1944-1979.
United States--Foreign relations--El Salvador.
Harvard subject headings:
El Salvador--Politics and government--1944-1979.
El Salvador--Relations--United States.
United States--Relations--El Salvador.
Princeton subject headings:
El Salvador--Foreign relations--United States.
El Salvador--Politics and government--1979-1992.
United States--Foreign relations--El Salvador.