Mt St. Helens.com
Main photograph by Joseph Rosenbaum
West Virginia Division of Homeland Security and Emergency Management
Gifford Pinchot National Forest
Tilling, Topinka, and Swanson, 1990, Eruptions of Mount St. Helens: Past, Present, and Future: USGS Special Interest Publication
CVO website
Exceprts from: U.S. Forest Service, Volcano Review: A Visitor's Guide to Mount St. Helens National Volcanic Monument: Summer/Fall 2000
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