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"Mammoth Cave National Park." National Geographic. N.p., n.d. Web. 20 Oct. 2013.

Mammoth Cave National Park (park, Kentucky, United States)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 20 Oct. 2013.

"Travel Maestro." Travel Maestro. N.p., n.d. Web. 20 Oct. 2013.

"OutdoorHub." OutdoorHub. N.p., n.d. Web. 20 Oct. 2013.