FACTOID # 22: South Dakota has the highest employment ratio in America, but the lowest median earnings of full-time male employees.
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Encyclopedia > United States National Park

The parks of the United States National Park system are one type of protected area in the United States and are operated by the U.S. National Park Service. Yellowstone National Park was the first national park in the world.

See also

External link

  • A Brief History of the National Park Service (http://www.cr.nps.gov/history/hisnps/NPShistory/briefhistory.htm)



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