Ecological Responses to the 1980 Eruption of Mount St Helens
(Eds) V. Dale, F. Swanson and C. Crisafulli
Springer Verlag, 342 pages
Available in print from university libraries, used bookstores or paid download from publisher.
http://www.springer.com/life+sciences/ecology/book/978-0-387-23868-5
Scans of some chapters are available free online.