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    Only one Earth the care and maintenance of a small planet : an unofficial report commissioned by the Secretary-General of the United Nations Conference on the Human Environment ; p... nork Ward, Barbara 1914-, Dubos, Renâe J. 1901-

    Argitaratua 1972
    Liburua

    Only one Earth the care and maintenance of a small planet : an unofficial report commissioned by the Secretary-General of the United Nations Conference on the Human Environment ; prepared with the assistance of a 152-member Committee of Corresponding Consultants in 58 countries

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