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(cxxi) Sraith Conarthaí 18/1977.Coinbhinsiún maidir leis na Rialacháin Idirnáisiúnta chun Imbhualadh ar Muir a chosc.THáinig i bhfeidhm d'Éirinn an 19 Nollaig,1977.
(cxxi) Treaty Series 18/1977.Convention on the International Regulations for Preventing Collisions at Sea.entered into Force for Ireland on 19 December,1977.