File:Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped).jpg
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![File:Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Dave_Johnston_with_gas-detection_instrument_at_Mount_St._Helens%2C_4_April_1980_%28USGS%29_2_%28cropped%29.jpg/484px-Dave_Johnston_with_gas-detection_instrument_at_Mount_St._Helens%2C_4_April_1980_%28USGS%29_2_%28cropped%29.jpg?20180605043419)
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Categories:
- 30-year-old human males
- April 1980 United States photographs
- Black and white photographs of men at work
- Black and white photographs of the United States in the 1980s
- David A. Johnston at work at Mount St. Helens
- Low-angle shots of people
- Men at work in the 1980s
- Black and white photographs of men with beards
- 1980 in Washington (state)
- People of the United States in 1980
- Scientists in 1980
- Squinting