Topographic map, Mount St. Helens, C.E. 1919 annotated with locations

Detailed Description
Topographic map, Mount St. Helens, C.E. 1919 annotated with locations of volcanic deposits from ~275 to 12.8 ka. Due to the cataclysmic eruption of May 18, 1980, many of the locations annotated on this map are not either covered or not longer visible.
Sources/Usage
Public Domain.