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Lassen Volcanic National Park
All four types of volcanoes are found within Lassen Volcanic National Park's 106,000 acres. Visit the virtual visitor information center to learn about the park's unique geology. Selected links include photos from the 1915 eruption of Lassen Peak, a glossary of terms, a geologic time scale, and U.S. Geological Survey publications.
http://www.nps.gov/lavo/index.htm

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