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On March 1, 1872 President Ulysses S. Grant signed into existence the world's first national park, Yellowstone National Park. The 2.2 million acres of wilderness is the only complete mid-latitude ecosystem left on the planet. National Parks Exploration Series: Yellowstone
National Parks Exploration Series: Yellowstone streaming . Photo : National Parks Exploration Series: Yellowstone date 2011-12-01
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