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Volcano, California - Wikipedia
California has active and hazardous volcanoes
VISIT VOLCANO - Home
History - Visit the Volcano City in CA
Volcano California - Western Mining History
Volcano, California: A Hidden Little Gem In Amador County
Lassen Volcanic National Park (U.S. National Park Service)
A Guide to California's Volcanoes
A risky California volcano has been seeing more earthquakes
California Volcano Observatory | U.S. Geological Survey - USGS.gov