Other
National Resources Canada: Landslides and Snow Avalanches
Defines a landslide, avalanche, and a rockslide and provides examples. Describes the causes and effects of these events.
US Geological Survey
Usgs: Rockslide Debris Avalanche of May 18, 1980
Provides information on the rockslide that occurred at Mount St. Helens on May 18, 1980. Site is in outline form.