Yellowstone Volcano Observatory
The US Geological Survey has detailed information about the supervolcano.
The Geological Society
An in-depth study of the effects of super-eruptions.
Discovery.com describes what is under Yellowstone.
Volcano news and information from expert John Seach.
A University of North Dakota site with information about volcanoes around the world.
How Volcanoes Work
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A NASA sponsored site about volcano science.