Columbia subject headings:
Foreign trade regulation--Poland--Periodicals.
Poland--Commerce--Periodicals.
Poland--Commercial policy--Periodicals.
Tariff--Government policy--Poland.
Tariff--Poland.
Harvard subject headings:
Foreign trade regulation--Poland--Periodicals.
Poland--Commerce--Periodicals.
Poland--Commercial policy--Periodicals.
Princeton subject headings:
Foreign trade regulation--Poland--Periodicals.
Periodicals.
Poland--Commerce--Periodicals.
Poland--Commercial policy--Periodicals.