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  1. Engelhardt, Wolfgang [Editor] ; Deutscher Naturschutzring, Conference on Environment and Development 1992 Rio de Janeiro, Conference on Environment and Development 1992 Rio de Janeiro

    Der Erdgipfel : Perspektiven für die Zeit nach Rio

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    Bonn: Economica-Verl., 1993

  2. Environment protection engineering

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    Wrocław: Technical Univ., 1975- / 1.1975 -

    Published in: Physicochemical methods for water and wastewater treatment

  3. Mackenthun, Kenneth M. [Author]

    Toward a cleaner aquatic environment

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    Washington D. C.: Environmental Protection Agency, 1973

  4. International Union of Air Pollution Prevention Associations, Air and Waste Management Association, World Clean Air Congress 9 1992 Montréal

    Towards the year 2000: critical issues in the global environment : papers from the 9th World Clean Air Congress, Montréal, Québec, Canada, August 30 - September 4, 1992 / Vol. 4, Air pollution control = Contrôle de la pollution de l'air

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    Pittsburgh, Pa.: A&WMA, 1992

    Published in: Towards the year 2000: critical issues in the global environment / sponsored by International Union of Air Pollution Prevention Associations. Host association: Air & Waste Management Association ; 4.1992