David Callow
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Norris Geyser Basin © David Callow
Yellowstone – 1 © David Callow
Yellowstone – 2 © David Callow
Yellowstone – 4 © David Callow
Yellowstone – 3 © David Callow
Yellowstone – 7 © David Callow
Yellowstone – 5 © David Callow
Yellowstone – 6 © David Callow
Fire goes into the Firehole River © David Callow