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^"Sierra de Huautla". UNESCO Ecological Sciences for Sustainable Development. July 2012. Retrieved April 25, 2019.
^"¿Sabías qué...? - Tierra, Jojutla y Campo" [Did you know...? - Earth, Jojutla, and Fields] (in Spanish). Agencia Espacial Mexicana. October 18, 2017. Archived from the original on December 20, 2018. Retrieved March 18, 2019.