Glacier extent maps from before and after May 18, 1980.

By Volcano Hazards Program 1981 (approx.)

Glacier extent maps from before and after May 18, 1980....

Original Thumbnail Medium

Detailed Description

Glacier extent maps on Mount St. Helens from before and after the May 18, 1980 eruption.

Sources/Usage

Public Domain.

Brugman and Post, 1981