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Ancient Observatories: Chaco Canyon
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www.exploratorium.edu/...flash.html
observatories
astronomy
history
USA
interactive
iwb
Chaco
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International School of Central Switzerland
on 26 Jul 09
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International School of Central Switzerland
on 26 Jul 09
Journey into Chaco Canyon, where ancient people built monuments to the cosmos.
Journey into Chaco Canyon, where ancient people built monuments to the cosmos.
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