Columbia subject headings:
Tariff--United States--Periodicals.
United States Tariff Commission--Periodicals.
United States--Commerce--Periodicals.
Harvard subject headings:
Tariff--United States--Periodicals.
United States Tariff Commission--Periodicals.
United States--Commerce--Periodicals.
Princeton subject headings:
Periodicals.
Tariff--United States--Periodicals.
United States Tariff Commission--Periodicals.
United States--Commerce--Periodicals.