More about Mount St. Helens Glaciers

Glaciation at Mount St. Helens

http://volcanoes.usgs.gov/volcanoes/st_helens/st_helens_geo_hist_104.html

 

Photographic Documentation of the Evolution of Crater Glacier, Mount St. Helens, Washington, September 2006–November 2009

By Joseph S. Walder, Steven P. Schilling, David R. Sherrod, and James W. Vallance

U.S. Geological Survey Open-File Report 2010-1141

Download .pdf files @ http://pubs.usgs.gov/of/2010/1141/