30 Cool facts about Mount St. Helens [electronic resource] : commemorating the 30th anniversary of the 1980 eruptions of Mount St. Helens, come and explore / by Carolyn Driedger ... [et al.] ; U.S. Geological Survey ; U.S. Forest Service ; Mount St. Helens Institute.
Imprint
[Reston, Va.] : U.S. Dept. of Interior, U.S. Geological Survey, [2010]
