Wordnet polsko-angielski 
                         (an association of nations to promote free trade within the union and set common tariffs for nations that are not members) 
customs union 
Słownik polsko-angielski mLingua © Internetowe Centrum Tłumaczeń mLingua
                        customs union
Słownik biznesmena polsko-angielski 2006, Piotr Kapusta, Magdalena Chowaniec
                        customs/tariff unio