Columbia subject headings:
El Salvador--Commerce--Periodicals.
El Salvador--Commercial policy--Periodicals.
Foreign trade regulation--El Salvador--Periodicals.
Harvard subject headings:
El Salvador--Commerce--Periodicals.
El Salvador--Commercial policy--Periodicals.
Foreign trade regulation--El Salvador--Periodicals.
Princeton subject headings:
El Salvador--Commerce--Periodicals.
El Salvador--Commercial policy--Periodicals.
Foreign trade regulation--El Salvador--Periodicals.
Periodicals.