Columbia subject headings:
Developing countries--Commerce--United States.
Protectionism--Developing countries.
United States--Commerce--Developing countries.
Harvard subject headings:
Developing countries--Commerce--United States.
Protectionism--Developing countries.
United States--Commerce--Developing countries.
Princeton subject headings:
Developing countries--Commerce--United States.
Protectionism--Developing countries.
United States--Commerce--Developing countries.