Council Regulation (EEC) No 3921/91 of 16 December 1991 laying down the conditions under which non-resident carriers may transport goods or passengers by inland waterway within a Member State
Uredba Sveta (EGS) št. 3921/91 z dne 16. decembra 1991 o določitvi pogojev, pod katerimi lahko tuji prevozniki prevažajo blago ali potnike po celinskih plovnih poteh znotraj države članice