Message From the Mountain
As Seen at the Mount St. Helens Johnston Ridge ObservatoryDVD - 1997
The eruption of Mount St. Helens and its related geological observations.
Publisher: Boston, MA : Produced by Northern Light Productions for the USDA Forest Service with the US Geological Survey, c1997
Characteristics: 1 videodisc : sd., col. ; 4 3/4 in