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USGS scientists installing a temperature sensor under a public boardwalk in Norris Geyser Basin, Yellowstone National Park ca. June 2010
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USGS scientists installing a temperature sensor un...

USGS scientists installing a temperature sensor under a public boardwalk in Norris Geyser Basin, Yellowstone National Park ca. 2010
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USGS scientists installing a temperature sensor un...

Along the Gardiner River, Yellowstone National Park. Seen only by tourists going via Gardiner Gateway ca. 1909
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Along the Gardiner River, Yellowstone National Par...

Liberty Cap at Mammoth Hot Springs, Yellowstone National Park, Wyoming, reached by the Northern Pacific Railway via Gardiner Gateway ca. 1909
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Liberty Cap at Mammoth Hot Springs, Yellowstone Na...

A hot spring
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A hot spring