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  • Libros de autor by John F. Caddy Ph.D.

    Did Extraterrestrials Bring Us to Intelligence on Our Planet? a Scientist Speculates on the Sparse Information Available from Prehistory
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    Did Extraterrestrials Bring Us to Intelligence on Our Planet? a Scientist Speculates on the Sparse Information Available from Prehistory
    John F. Caddy Ph.D.