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Gēteborgas 1999. gada Protokols par acidifikācijas, eitrofikācijas un piezemes ozona samazināšanu
environ., UN	1999 Gothenburg Protocol to Abate Acidification, Eutrophication and Ground-level Ozone; Gothenburg Protocol; Protocol to Abate Acidification, Eutrophication and Ground-level Ozone; Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution to abate Acidification, Eutrophication and Ground-Level Ozone