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Black sand pool, upper basin of the Yellowstone. Yellowstone National Park. - NARA - 517029.tif - US National Archives bot
Black sand pool, upper basin of the Yellowstone. Yellowstone National Park. - NARA - 517029.jpg - US National Archives bot
Black Sand Spring, upper Fire Hole. Yellowstone National Park. - NARA - 517239.jpg - US National Archives bot
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