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https://www.lonelyplanet.com/peru/cuzco-and-the-sacred-valley/cuzco/travel-tips-and-
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Kane, Cynthia, (March 5, 2015). Peru’s Other Lost City. BBC Travel. Retrieved from
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“Machu Picchu’s Annual Tourism Revenue Totals US$35.9mn” (2017). Andina. Retrieved from
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Salazar, Carla. (August 28, 2013). Tramway planned for Machu Picchu’s ‘sister city.’ Yahoo! News. Retrieved
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