Topographic map, Mount St. Helens, C.E. 1919 annotated with locatio...
By Volcano Hazards Program
2005 (approx.)
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Detailed Description
Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are now either covered or no longer visible.
Sources/Usage
Public Domain.
Adapted from Clynne et. al., 2005