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USGS scientists installing a temperature sensor under a public boardwalk in Norris Geyser Basin, Yellowstone National Park ca. June 2010
UMG22A39_366

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
UMG22A39_364

USGS scientists installing a temperature sensor un...

Workers removing boardwalk at Palette Spring in Mammoth Hot Springs in Yellowstone National Park; Date: 16 February 2006
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Workers removing boardwalk at Palette Spring in Ma...

Railroad ABC - X is for Express, Y for Yellowstone Park, & Z is for Zero
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Railroad ABC - X is for Express, Y for Yellowstone...