The small but interesting fumarole area at West Thumb

(June 30, 2000)

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Bluebell Pool and Seismograph Pool

(June 30, 2000)

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Fishing Cone hot spring, just under the waters of Lake Yellowstone

(June 30, 2000)

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The Black Pool, now deep blue due to a change in temperature

(June 30, 2000)

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