Bibliography
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4. Zimmermann, K. (2013, February 26). Grand Canyon: Location, Formation & Facts. LiveScience. Retrieved September 25, 2014, from http://www.livescience.com/27489-grand-canyon.html
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2. States. National Park Service. (2014, September 24). Natural Features & Ecosystems. National Parks Service. Retrieved September 25, 2014, from http://www.nps.gov/grca/naturescience/naturalfeaturesandecosystems
3. PBS LearningMedia. (n.d.). The Grand Canyon: How It Formed. Retrieved September 25, 2014, from http://www.pbslearningmedia.org/resource/ess05.sci.ess.earthsys.canyon/the-grand-canyon-how-it-formed/
4. Zimmermann, K. (2013, February 26). Grand Canyon: Location, Formation & Facts. LiveScience. Retrieved September 25, 2014, from http://www.livescience.com/27489-grand-canyon.html
5. Oskin, B. (2013, March 27). 7 Amazing Grand Canyon Facts. LiveScience. Retrieved September 25, 2014, from http://www.livescience.com/31903-amazing-grand-canyon-facts.html
6. States. National Park Service. (2014, September 24). Park Statistics. National Parks Service. Retrieved September 25, 2014, from http://www.nps.gov/grca/parkmgmt/statistics
7. Grand Canyon Facts from the National Geographic Visitor Center. (n.d.). Grand Canyon National Geographic Visitor Center. Retrieved September 25, 2014, from http://explorethecanyon.com/explore-learn/grand-canyon-facts/
8. Grand Canyon National Park - National Geographic. (1919, February 26). National Geographic. Retrieved September 25, 2014, from http://travel.nationalgeographic.com/travel/national-parks/grand-canyon-national-park/
9. States. National Park Service. (2014, September 21). Environmental Factors. National Parks Service. Retrieved September 23, 2014, from http://www.nps.gov/grca/naturescience/environmentalfactors
10. Jolley, English, L. W. (n.d.). Extension Forestry & Natural Resources. What is fecal coliform? Why is it important? : Extension : Clemson University : South Carolina. Retrieved September 25, 2014, from http://www.clemson.edu/extension/natural_resources
11. Pacific Northwest Research Station. (2014, August 5). Fuel Treatments: Thinning and Prescribed Burns. Retrieved September 25, 2014, from http://www.fs.fed.us/pnw/research/fire/fuel-treatments.shtml
12. States. National Park Service. (2014, September 24). Nonnative Species. National Parks Service. Retrieved September 25, 2014, from http://www.nps.gov/grca/naturescience/nonnativespecies