Columbia subject headings:
Gdańsk (Poland)--Commercial policy.
Tariff--Poland--Gdańsk.
Harvard subject headings:
Customs administration--Poland--Gdańsk.
Free ports and zones--Law and legislation--Poland.
Free ports and zones--Poland--Gdańsk.
Gdańsk (Poland)--Commerce.
Princeton subject headings:
Customs administration--Poland--Gdańsk--History.
Tariff--Poland--Gdańsk--Law and legislation--History.