Yellowstone National Park
Yellowstone National Park, established by the U.S. Congress in 1872, was the first national park in the United States. The majority of the park's 3,468 square miles remain undeveloped, and visitors can explore more than 1,000 miles of trails. The park was designated a World Heritage site in 1978.
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Yellowstone National Park
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Yellowstone National Park. (2013). The History Channel website. Retrieved 1:19, May 24, 2013, from http://www.history.com/topics/yellowstone-national-park.
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Yellowstone National Park. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/topics/yellowstone-national-park [Accessed 24 May 2013].
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“Yellowstone National Park.” 2013. The History Channel website. May 24 2013, 1:19 http://www.history.com/topics/yellowstone-national-park.
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“Yellowstone National Park,” The History Channel website, 2013, http://www.history.com/topics/yellowstone-national-park [accessed May 24, 2013].
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“Yellowstone National Park,” The History Channel website, http://www.history.com/topics/yellowstone-national-park (accessed May 24, 2013).
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Yellowstone National Park [Internet]. The History Channel website; 2013 [cited 2013 May 24] Available from: http://www.history.com/topics/yellowstone-national-park.
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Yellowstone National Park, http://www.history.com/topics/yellowstone-national-park (last visited May 24, 2013).
AMA Style
Yellowstone National Park. The History Channel website. 2013. Available at: http://www.history.com/topics/yellowstone-national-park. Accessed May 24, 2013.