Category:David A. Johnston at work at Mount St. Helens
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Media in category "David A. Johnston at work at Mount St. Helens"
The following 11 files are in this category, out of 11 total.
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Dave Johnston collecting sample from Mount St. Helens crater lake, 30 April 1980 (USGS).jpg 3,483 × 2,329; 8.73 MB
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Dave Johnston going into Mount St. Helens crater to sample lake, 30 April 1980 (USGS).jpg 3,483 × 2,329; 8.32 MB
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Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 1.jpg 6,489 × 5,005; 11.44 MB
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Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2.jpg 2,679 × 4,116; 5.37 MB
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The Legacy of David A. Johnston (17754441319).jpg 598 × 463; 86 KB