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  1. Project Gutenberg

    Free e-book The nature of man : by Élie Metchnikoff

    Get a free copy of this e-book here: https://www.gutenberg.org/ebooks/75505 Language: English Read more...
  2. Project Gutenberg

    Free e-book Das Protistenreich by Ernst Haeckel

    Get a free copy of this e-book here: https://www.gutenberg.org/ebooks/75352 Language: German Read more...
  3. Project Gutenberg

    Free e-book The Cambridge natural history, vol. ix : by Arthur Humble Evans

    Get a free copy of this e-book here: https://www.gutenberg.org/ebooks/74964 Language: English Read more...
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