Columbia subject headings:
Harvard subject headings:
El Salvador--Foreign relations--United States.
El Salvador--Politics and government--1979-1992.
Guerrillas--Central America.
United States--Foreign relations--El Salvador.
Princeton subject headings:
El Salvador--Foreign relations--United States.
El Salvador--Politics and government--1979-1992.
Guerrillas--Central America.
United States--Foreign relations--El Salvador.