Category:David A. Johnston at work at Mount St. Helens

Media in category "David A. Johnston at work at Mount St. Helens"

The following 11 files are in this category, out of 11 total.

• 
  Dave Johnston collecting sample from Mount St. Helens crater lake, 30 April 1980 (USGS) cropped.jpg 2,200 × 1,400; 352 KB
  
• 
  Dave Johnston collecting sample from Mount St. Helens crater lake, 30 April 1980 (USGS).jpg 3,483 × 2,329; 8.73 MB
  
• 
  Dave Johnston going into Mount St. Helens crater to sample lake, 30 April 1980 (USGS) cropped.jpg 3,110 × 2,235; 924 KB
  
• 
  Dave Johnston going into Mount St. Helens crater to sample lake, 30 April 1980 (USGS).jpg 3,483 × 2,329; 8.32 MB
  
• 
  Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 1.jpg 6,489 × 5,005; 11.44 MB
  
• 
  Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped).jpg 786 × 973; 437 KB
  
• 
  Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2.jpg 2,679 × 4,116; 5.37 MB
  
• 
  David Johnston near crest of the bulge on the north side of Mount St. Helens, 17 May 1980 (USGS) cropped 1.JPG 1,200 × 1,000; 174 KB
  
• 
  David Johnston near crest of the bulge on the north side of Mount St. Helens, 17 May 1980 (USGS) cropped 2.JPG 600 × 500; 52 KB
  
• 
  David Johnston near crest of the bulge on the north side of Mount St. Helens, 17 May 1980 (USGS).jpg 3,483 × 2,329; 7.82 MB
  
• 
  The Legacy of David A. Johnston (17754441319).jpg 598 × 463; 86 KB