- 
              
            711Managing planet earth perspectives on population, ecology, and the lawBaskı/Yayın Bilgisi 1990Kitap
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            712
- 
              
            713
- 
              
            714Environmental issues in the decade 1990-2000 their implications for education.Baskı/Yayın Bilgisi 1990Kitap
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            715Ecologically sustainable development in international development cooperation an interim policy statement.Baskı/Yayın Bilgisi 1990Kitap
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            716
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            717
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            718
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            719
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            720


