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Dr. Jacob Lowenstern leading a field trip Yellowstone National Park

By Yellowstone Volcano Observatory 2017 (approx.)
Dr. Jacob Lowenstern, Scientist-in-Charge of the Yellowstone Volcano Observatory during 2002-2017.
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Detailed Description

Dr. Jacob Lowenstern, Scientist-in-Charge of the Yellowstone Volcano Observatory during 2002-2017. In this photo, he's leading a field trip in Yellowstone National Park with a group of international volcanologists. 

Sources/Usage

Public Domain.