In this May 21, 2011, file photo, tourists photograph Old Faithful erupting on schedule late in the afternoon in Yellowstone National Park, Wyo. (AP Photo/Julie Jacobson, File)
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In this May 21, 2011, file photo, tourists photograph Old Faithful erupting on schedule late in the afternoon in Yellowstone National Park, Wyo. (AP Photo/Julie Jacobson, File)
