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Work cat.: (senamhi): WMO Symposium on the Long-Range Transport of Pollutants and its Relation to General Circulation Including Stratospheric-Tropospheric Exchange Processes Sofía, Bulgaria 1979 27572, Papers presented at the WMO Symposium on the Long-Range Transport of Pollutants and its Relation to General Circulation Including Stratospheric-Tropospheric Exchange Processes, Sofía, 1-5 October 1979, 1979