Earth: The sphere

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1. All documents are presented in Arial 12 with no spacing between lines in the same para.
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4. Date published corresponds to the date the paper was published on Oboulo.com.

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Since 1999, Oboulo.com has been striving to create one of the largest publicly accessible and publicly authored document databases on the Internet. These documents are unique and cannot be found elsewhere, whether in libraries or in any other search engine.

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