Here are some more links to get more information:

http://www.olywa.net/radu/valerie/StHelens.html

http://en.wikipedia.org/wiki/Mount_St._Helens

http://www.fs.fed.us/gpnf/mshnvm/

http://www.fs.fed.us/gpnf/volcanocams/msh/

http://vulcan.wr.usgs.gov/Volcanoes/MSH/

http://vulcan.wr.usgs.gov/Volcanoes/MSH/NatMonument/framework.html

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