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    Human ecology environmental education and sustainable development. Volume 1 (Report of the ninth Commonwealth Conference on development and human ecology, University of Edinbugh 1...

    Argitaratua 1991
    Liburua

    Human ecology environmental education and sustainable development. Volume 1 (Report of the ninth Commonwealth Conference on development and human ecology, University of Edinbugh 19th-23rd July 1989.

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