(1989). The world book encyclopedia of sciene: The planet earth. World Book,Inc.
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Tohutoru Kātū Chicago (17th ed.)
The World Book Encyclopedia of Sciene: The Planet Earth. Chicago: World Book,Inc, 1989.
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Tohutoro MLA (9th ed.)
The World Book Encyclopedia of Sciene: The Planet Earth. World Book,Inc, 1989.
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