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Yellowstone National Park Official site

An extensive Yellowstone photographic gallery on the official NPS.gov site Images should be free under public licence for Wiki-pedia use.

USGS: Volcanic History of the Yellowstone Plateau Volcanic Field

Tracking Changes in Yellowstone's Restless Volcanic System, U.S. Geological Survey, Fact Sheet 100-03, 2004

Life at high temperatures - An introduction to Yellowstone's thermophilic bacteria.

Scientific American Magazine (June 2004 Issue) Lessons from the Wolf