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What are the toughest marathons in the world?

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  • Andes Adventures. "Inca trail to Machu Picchu 27.5 mile marathon." Accessed July 13, 2010.http://www.andesadventures.com/run2asum.htm
  • Cook, Gareth. "Untangling the mystery of the Inca." Wired. January 2007.http://www.wired.com/wired/archive/15.01/khipu.html
  • Cool Running. "Topic: hardest marathon." October 31, 2006.http://www.coolrunning.com/forums/Forum5/HTML/003754.shtml
  • Ely, Breckinridge. "World's most extreme marathons." Accessed July 13, 2010.http://www.forbes.com/2005/04/15/cx_cd_0415sport.html
  • Equinox Marathon. "Course description." November 23, 2009.http://www.equinoxmarathon.org/index.php?option=com_content&task=view&id=16&Itemid=40
  • Leadville Trail 100. "Leadville Trail Marathon overview." Accessed July 13, 2010.http://www.leadvilletrail100.com/lt100races/LeadvilleTrailMarathon/overview.aspx
  • Meissner, Sean. "Four days + four marathons = quadzilla." Marathon Maniacs. Accessed July 13, 2010.http://www.marathonmaniacs.com/QuadzillaforUR.htm
  • Pikes Peak Marathon.org. "A journey to the top and perhaps back." Accessed July 13, 2010.http://www.pikespeakmarathon.org/
  • Ramson, Jayme. "Pikes Peak Marathon vs. the toughest marathons in the world." Colorado Springs Gazette. August 20, 2006.http://www.skyrunner.com/story/2006p11.htm
  • Sahara Marathon. "The toughest footrace on Earth." Accessed July 13, 2010.http://www.saharamarathon.co.uk/about.html
  • Time. "Extreme marathons." Accessed July 13, 2010.http://www.time.com/time/photogallery/0,29307,1728844_1562079,00.html
  • Wellsphere. "World's most extreme marathons." June 12, 2009.http://www.wellsphere.com/running-article/world-s-most-extreme-marathons/710616

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