Interregional Seminar on the Development of the Mineral Resources of the Continental Shelf, Port-of-Spain, Trinidad and Tobago, 5-16 April 1971 : technical papers = Cycle d'études interrégional sur les ressources minérales du plateau continental, Port-d'Espagne (Trinité-et-Tobago), 5-16 Avril 1971 : documents techniques (United Nations, 1972)