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Sources
- Aboard the Underground Railroad: A National Register Travel Itinerary. National Park Service. (Accessed 5/18/09) http://www.nps.gov/nr/travel/underground/
- Ansel Adams Gallery. "Visit Us in Yosemite National Park." 2008. (Accessed 5/18/09) http://www.anseladams.com/content/yosemite/yosemite-national-park.html
- Kibe, Naomi. "Everglades National Park." NPS IVIP. 2008. (Accessed (5/18/09) http://www.nps.gov/oia/topics/ivip/ivip.htm
- McConnell, Harvey. "Brain Serotonin Production Directly Related to Degree of Sunlight." Lancet. December 5, 2002. (Accessed 5/18/09) http://www.docguide.com/news/content.nsf/news/8525697700573E1885256C86003D5B1F
- McIntosh, Phyllis. "Labor of Love." National Park. January 1, 2004. (Accessed 5/18/09) http://www.accessmylibrary.com/coms2/summary_0286-20027324_ITM
- National Park Service. "Award Winners," "About," "America the Beautiful Program," "International Volunteers-in-Parks Program," "NPS IVIP Application Process," "Yellowstone," "Youth Programs." NPS. (Accessed 5/18/09) http://www.nps.gov/
- National Park Service Civil War Web Site. "Civil War Parks." NPS. (Accessed 5/18/09) http://cwar.nps.gov/civilwar/
- National Park Service Junior Rangers. "The Ranger Zone." NPS. (Accessed 5/18/09) http://www.nps.gov/learn/juniorranger.htm
- Smit, Eefje. "Yellowstone." NPS IVIP. 2007. (Accessed 5/18/09) http://www.nps.gov/oia/topics/ivip/ivip.htm
- U.S. Department of the Interior. "Recreation." DOI Budget Highlights. 2005. (Accessed 5/18/09) http://www.doi.gov/budget/2005/05Hilites/DH47.pdf
- Volunteer.gov. "Gila Cliff Dwellings National Monument," "Aztec Ruins National Park," "Mount Rainier National Park Volunteer Coordinator." (Accessed 5/18/09) http://www.volunteer.gov/gov/results.cfm?ID=9303
- Women's Rights National Park. (Accessed 5/18/09)
