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"Black-Footed Ferret." National Parks Conservation Association. N.p., n.d. Web. 18 Dec. 2012.
Briggs, Bill, and Msnbc.com Contributor. "National Parks Feel the Effects of Human, Environmental Threats." Msnbc.com. Msnbc Digital Network, 30 Aug. 2010. Web. 19 Dec. 2012.
"The Carbon Cycle." WindowstotheUniverse.org. N.p., n.d. Web. 20 Dec. 2012.
"Ecological Effects of the '88 Yellowstone Fires: A Story of Surprise, Constancy, and Change." National Park Service. N.p., n.d. Web. 19 Dec. 2012.
Eversman, Sharon. "Lichens in Yellowstone National Park." National Park Service. N.p., n.d. Web. 19 Dec. 2012.
"Fire Facts." National Park Service. N.p., 18 Nov. 2012. Web. 20 Dec. 2012.
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"The Grand Canyon of the Yellowstone Online Tour Home Page - Yellowstone National Park." The Grand Canyon of the Yellowstone Online Tour Home Page - Yellowstone National Park. N.p., n.d. Web. 13 Dec. 2012.
"Information on the 2012 Wolf Hunt." National Parks Service. National Parks Service, 19 Dec. 2012. Web. 19 Dec. 2012.
"Keystone Conservation." 'Keystone Conservation' N.p., n.d. Web. 20 Dec. 2012.
"LARRY'S RAMBLE." : 2011-04-24. N.p., n.d. Web. 20 Dec. 2012.
"Lichens." Lichens. N.p., n.d. Web. 19 Dec. 2012.
"Lynx Cat Lynx." Lynx. N.p., n.d. Web. 20 Dec. 2012.
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"Nitrification." TheFreeDictionary.com. N.p., n.d. Web. 20 Dec. 2012.
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"The Nitrogen Cycle." Living in the Greenhouse. N.p., n.d. Web. 20 Dec. 2012.
"The Nitrogen Cycle." The Nitrogen Cycle. N.p., n.d. Web. 18 Dec. 2012. <http://www.eo.ucar.edu/kids/green/cycles7.htm>.
"The Nitrogen Cycle." Visionlearning.com. N.p., n.d. Web. 20 Dec. 2012.
"Phosphorus." EPA. Environmental Protection Agency, n.d. Web. 18 Dec. 2012.
Recent, For More Information on. "History of Wildland Fire in Yellowstone." National Parks Service. National Parks Service, 16 Nov. 2012. Web. 18 Dec. 2012.
Reece, Jane B., Martha R. Taylor, Eric J. Simon, Jean L. Dickey, and Neil A. Campbell. Seventh ed. San Francisco: Pearson Education, 2012. Print.
"The Role of Wolves as a Keystone Species." United States Environmental Protection Agency. N.p., n.d. Web. 20 Dec. 2012.
Steingisser, Alethea, and W. A. Marcus. "Human Impacts on Geyser Basins." National Park Service. N.p., n.d. Web. 19 Dec. 2012.
"Unit 4: Ecosystems." Learner. N.p., n.d. Web. 20 Dec. 2012.
"Wanna See a Wolf? Now's the Time." Defender's Blog. N.p., n.d. Web. 20 Dec. 2012.
"The Water Cycle." The Water Cycle, U.S. Geological Survey (USGS) Water Science School. N.p., n.d. Web. 18 Dec. 2012.
"Wolves in Yellowstone National Park." Experience Yellowstone. N.p., n.d. Web. 20 Dec. 2012.
"Yellow Stone National Park." Protopage. N.p., n.d. Web. 03 Dec. 2012. <http://www.protopage.com/1amandaterrijonathon>.
"The Yellowstone Fires of 1988." National Park Service. N.p., n.d. Web. 20 Dec. 2012.
"Yellowstone National Park." GORP. N.p., n.d. Web. 20 Dec. 2012.
"Yellowstone National Park." National Parks Conservation Association. N.p., n.d. Web. 20 Dec. 2012.
"Yellowstone National Park." Wallpapers. N.p., n.d. Web. 20 Dec. 2012.
"Yellowstone Wildflowers - Lily." Yellowstone Wildflowers - Lily. N.p., n.d. Web. 03 Dec. 2012. <http://www.yellowstonenationalpark.com/lily.htm>.