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V.C. Wald: Human merits only the laziest glance
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V.C. Wald: Steaming hotpools at Biscuit Basin & the Firehole River, Yellowstone
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V.C. Wald: Winter algae in the thermal runoff, Biscuit Basin
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V.C. Wald: Thermals claim a tree, Biscuit Basin, Yellowstone
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V.C. Wald: Debris, Biscuit Basin hydrothermal explosion of May, 2009
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V.C. Wald: Firehole River at Biscuit Basin, Yellowstone
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V.C. Wald: Cliff Geyser on Iron Creek, Black Sand Geyser Basin
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V.C. Wald: Tourists, Opalescent Pool
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V.C. Wald: Runoff, Black Sand Geyser Basin (Iron Creek)
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V.C. Wald: Opalescent Pool, Black Sand Geyser Basin
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V.C. Wald: Spouter Geyser, Black Sand Geyser Basin
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V.C. Wald: Active little geyser, Black Sand Geyser Basin
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V.C. Wald: Fountain Paint Pots, winter-pale
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V.C. Wald: Red Spouter, Lower Geyser Basin
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V.C. Wald: Red Spouter, Lower Geyser Basin
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V.C. Wald: Runoff and algae, thermal runoff
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V.C. Wald: Roots
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V.C. Wald: Lower Geyser Basin
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V.C. Wald: Runoff below Silex Spring
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V.C. Wald: Silex Spring and overflow-runoff, Lower Geyser Basin
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V.C. Wald: Silex Spring, Yellowstone National Park
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V.C. Wald: Edge, Silex Spring
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V.C. Wald: Ice-glazed snag, downwind of Red Spouter & Fountain Paint Pots
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V.C. Wald: Glazed snag, downwind of Red Spouter
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V.C. Wald: Rime ice and cold steam downwind from Silex Spring
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V.C. Wald: Bison v. snow machines
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V.C. Wald: Old Faithful Visitor Education Center
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V.C. Wald: Old Faithful Visitor Education Center
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V.C. Wald: Old Faithful Visitor Education Center
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V.C. Wald: Cliff Geyser