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Egipto.com: La Revolucion De Las Piramides
In Spanish, learn about improvements and changes to building pyramids as new pharaohs direct the empire. Pyramids now have stairs to carry those entombed to the heavens.
Other
Egipto.com: Origenes De Las Pirimides
In Spanish, good information on the origins of the Egyptian pyramids. This site has many more links for more in-depth information.