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Tepeilhuitl is the name of the thirteenth month of the Aztec calendar.It is also a festival in the Aztec religion dedicated to Popocatepetl, Iztaccihuatl and Tlaloc It is called the festival or feast of the Mountains
- "Tepeilhuitl, Festival of the Hills, the 13th Month of the Aztec Solar Calendar". World Digital Library. Retrieved 21 July 2013.
- Francesco Saverio Clavigero (1787). The history of Mexico: Collected from Spanish and Mexican historians, from manuscripts and ancient paintings of the Indians. Illustrated by Charts and other copper plates. To which are added, critical dissertations on the land, the animals, and inhabitants of Mexico. G. G. J. and Robinson. pp. 291–. Retrieved 21 July 2013.
- "The Aztec Festivals". www.amoxtli.org. Retrieved 25 July 2013.