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Glicken’s report on the May 18, 1980 debris avalanche at #MountStHelens available from the USGS. https://t.co/KxCjg0PimB https://t.co/YAMWCRkx54
Glicken’s report on the May 18, 1980 debris avalanche at #MountStHelens available from the USGS. https://t.co/KxCjg0PimB https://t.co/YAMWCRkx54