Columbia subject headings:
Exports--United States--Periodicals.
Foreign trade promotion--United States--Periodicals.
United States--Commercial policy--Periodicals.
Harvard subject headings:
Exports--United States--Periodicals
Foreign trade promotion--United States--Periodicals.
United States--Commercial policy--Periodicals.
Princeton subject headings:
Exports--United States--Periodicals.
Foreign trade promotion--United States--Periodicals.
Periodicals.
United States--Commercial policy--Periodicals.