Niger River Commission Transformed into Niger Basin Authority.-- Guinea Joins the Mano River Union.-- Feasibility Studies of Mano River Basin Development Project Completed.-- Relief from Pollution of the Rhine from Salt Discharges in Sight?.-- Fifteenth Session of the Interim Mekong Committee.-- First Biennial Report on the Quality of Great Lakes Waters.-- Activities of the United Nations Economic Commission for Europe.-- World Meteorological Organization Projects Underway.-- Work of the United Nations International Law Commission.-- Montreal Conference of the International Law Association.-- Publications Received.-- Call for Documents and Participation in the Information Exchange