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V.C. Wald: Black Pool WestThumb
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V.C. Wald: Artists' Paint Pots, Yellowstone
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V.C. Wald: Artists Paint Pots, Yellowstone
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V.C. Wald: Mud pots, Artist Paint Pots, Yellowstone
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V.C. Wald: Bacterial mat, Mammoth Hot Springs, Yellowstone
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V.C. Wald: Bacteria mat above Canary Spring, Mammoth
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V.C. Wald: Biscuit Basin, Firehole River, Yellowstone
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V.C. Wald: Swimming hole, "Boiling River" Gardner River, Yellowstone
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V.C. Wald: "Boiling River" hot spring souce, Gardner River
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V.C. Wald: Thermal vent at "Boiling River" Gardner River, Yellowstone
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V.C. Wald: Canary Spring, Mammoth
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V.C. Wald: Canary Spring, Mammoth
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V.C. Wald: Canary Spring & Mammoth Hot Springs travertine terraces
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V.C. Wald: Hot end of the hot pool, Chico Hot Springs
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V.C. Wald: Chico pool, hot and steamy
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V.C. Wald: Chinaman Spring in the Upper Geyser Basin, Yellowstone National Park
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V.C. Wald: Canary Spring, Mammoth Hot Springs, Yellowstone National Park
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V.C. Wald: Echinus geyser, Norris Geyser Basin back-basin
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V.C. Wald: Firehole River
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V.C. Wald: Fishing Cone, West Thumb
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V.C. Wald: Fountain
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V.C. Wald: Fountain Paint Pots
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V.C. Wald: Fountain Paint Pots
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V.C. Wald: Little geyser, Hayden Valley
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V.C. Wald: Grand Prismatic Spring, Yellowstone
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V.C. Wald: Grand Prismatic Spring, Yellowstone National Park
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V.C. Wald: Grand Prismatic Spring, eye level!
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V.C. Wald: Great Fountain in eruption
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V.C. Wald: Imperial Geyser
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V.C. Wald: Imperial Geyser, Yellowstone National Park