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Yellowstone National ParkRoosevelt Arch is at the park's North Entrance
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Yellowstone National Park
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hot spring crossection
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Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.

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Last Updated: July 25, 2006 at 00:23 EST