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  1. 1
    Published 1992
    “...HC 663.5 .S9645...”
    Book
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    Sustainable management.
  2. 2
    Published 1992
    “...HC 79 .E5 .U582 1992...”
    Conference Proceeding Book
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    Saved in:
    United Nations Conference on Environment and Development, 3-14 June, 1992, Rio de Janeiro, Brazil : outcomes of the conference.

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