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  1. 1
    Earth and the universe
    by Kerrod
    Published 1993
  2. 2
    Ensiklopedia angkasa lepas
    by Wajnberg
    Published 2020
  3. 3
    Encyclopedia space
    by Wajnberg
    Published 2020
  4. 4
    The Universe
    Published 1998
  5. 5
    Space
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    Published 2006
  6. 6
    Sky and earth
    Published 1996
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