"De Forenede Nationer. Den Økonomiske Kommission for Europa." . . "Umweltschutz." . . . . "United Nations. Economic Commission for Europe. Committee on Gas." . . . "Conference papers and proceedings"@en . . "Conference papers and proceedings" . . . . "The Gas industry and the environment : proceedings of a symposium of the Committee on Gas, Economic Commission for Europe, Minsk, Byelorussian SSR, 20-27 June, 1977" . "The gas industry and the environment : Proceedings of a symposium of the Committee on Gas, Economic Commission for Europe, Minsk, Byelorussian SSR, 20-27 June 1977" . "The gas industry and the environment : proceedings of a symposium of the Committee on Gas, Economic Comm. for Europe, Minsk, Byelorussian SSR, 20-27 June 1977" . . . . "The Gas industry and the environment proceedings of a symposium of the Economic Commission for Europe Committee on gas, Minsk, Byelorussian SSR, 20-27 June, 1977"@en . . . . . "The Gas industry and the environment : proceedings of a symposium of the Committee on Gas, Economic Commission for Europe, Minsk, Byelorussian SSR, 20-27 June 1977" . . . "The gas industry and the environment" . "The Gas industry and the environment : proceedings of a symposium of the Economic Commission for Europe Committee on gas, Minsk, Byelorussian SSR, 20-27 June, 1977" . "The gas industry and the environment : proceedings of a symposium of the Committee on Gas, Economic Commission for Europe, Minsk, Byelorussian SSR, 20-27 June 1977"@en . . "The gas Industry and the environment" . . "Conference proceedings"@en . . . . . . "The gas industry and the environment proceedings of a symposium of the Committee on Gas, Economic Commission for Europe, Minsk, Byelorussian SSR, 20-27 June 1977"@en . . . . "Gaswirtschaft." . . "Gaz Industrie Aspect de l'environnement Congrès." . . "Symposium on the Gas Industry and the Environment (1977 : Minsk)" . . .