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Yellowstone National ParkLower Falls in the Grand Canyon of the Yellowstone plunges more than 300 feet.
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Yellowstone National Park
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Summer Crowd at Old Faithful.  

Did You Know?
At peak summer levels, 3,500 employees work for Yellowstone National Park concessioners and about 800 work for the park.

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Last Updated: June 19, 2007 at 10:50 EST