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  1. 11
    by Durrell, Lee
    Published 1986
    Book

    State of the ark
  2. 12
    Published 1984
    Available for UP System via Cambridge Core.
    Continuing Resource

    Australian journal of environmental education.
  3. 13
    Published 1974
    Available for UP System via Cambridge Core eJournals Collection
    Continuing Resource

    Environmental conservation.
  4. 14
    Published 1973
    Book

    World dierctory of environmental organizations.
  5. 15
    Available for UP Diliman via SAGE Knowledge
    Electronic Resource

    Community-based natural resource management issues and cases from South Asia
  6. 16
    Available for UP System via SAGE Journals
    Electronic Resource

    Air, soil and water research.
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