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Seismic station VALT in Mount St. Helens crater, view toward the south ca. June 2010
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Seismic station VALT in Mount St. Helens crater, v...

1980 - Mount St. Helens soon after the May 18, 1980 eruption, as viewed from Johnston's Ridge.
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1980 - Mount St. Helens soon after the May 18, 198...

1981 - Gas Sampling around the Mount St. Helens Dome
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1981 - Gas Sampling around the Mount St. Helens Do...

Mount St. Helens north flank at timberline, Skamania County, Washington. August, 1964
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Mount St. Helens north flank at timberline, Skaman...

This photo was taken on July 15, 1980 which shows the after-effects of the Mount St. Helens eruption. Here we see mudflow almost to the top of the mailbox posts near Cowlitz River in Cowlitz County, W...
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This photo was taken on July 15, 1980 which shows ...

An iconic aerial view of the eruption of Mount St. Helens. Skamania County, Washington. May 18, 1980.
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An iconic aerial view of the eruption of Mount St....

Pre-1980 Eruption of Mount St. Helens
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Pre-1980 Eruption of Mount St. Helens