Image: Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped)

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Description: The late Dr. David Johnston, U.S. Geological Survey, using a correlation spectrometer which measures ultra-violet radiation as an indicator of the sulfur dioxide content of gases ejected from Mount St. Helens. Skamania County, Washington. 1980. Published on p. B100 in U.S. Geological Survey. Professional paper 1240-B. 1981.
Title: Dave Johnston with gas-detection instrument at Mount St. Helens, 4 April 1980 (USGS) 2 (cropped)
Credit: ID. Mount St. Helens - 32 (USGS) - alternative ID number: msh00032
Author: Unknown (taken by or for USGS)
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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