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Edwin Hubble (edita)

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== Referències ==

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* Hubble, Edwin Powell (1920). Photographic investigations of faint nebulae. Chicago, Ill., The University of Chicago Press.

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* Fool Me Twice: Fighting the Assault on Science in America. Harmony/Rodale. 11 de octubre de 2011. ISBN 9781609613204

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* Hubble, Edwin Powell (1920). Photographic investigations of faint nebulae. Chicago, Ill., The University of Chicago Press

== Bibliografia ==

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