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  1. 1
    Earth and the universe
    by Kerrod
    Published 1993
  2. 2
    The greenhouse effect
    by HARE
    Published 1990
  3. 3
    Planet earth
    Published 1997
  4. 4
    Bumi
    by Dixon
    Published 2001
  5. 5
    Hujan asid
    by Hare
    Published 1994
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