File:Dave Johnston going into Mount St. Helens crater to sample lake, 30 April 1980 (USGS).jpg
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![File:Dave Johnston going into Mount St. Helens crater to sample lake, 30 April 1980 (USGS).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Dave_Johnston_going_into_Mount_St._Helens_crater_to_sample_lake%2C_30_April_1980_%28USGS%29.jpg/800px-Dave_Johnston_going_into_Mount_St._Helens_crater_to_sample_lake%2C_30_April_1980_%28USGS%29.jpg?20100410154343)
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