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"Usos y costumbres lesionan derechos" [Uses and customs harm rights]. El Universal (in Spanish). Mexico City. August 29, 2012. Retrieved March 1, 2013.
hidalgo.gob.mx
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Alejandro Reyes Alvarez (February 21, 2012). "Lenguas indígenas podrían perderse" [Indigenous language could be lost]. Milenio (in Spanish). Pachuca. Retrieved March 1, 2013.
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Leonardo Fernández–Badillo; Irene Goyenechea–Mayer Goyenechea (December 2010). "Anfibios y reptiles del valle del Mezquital, Hidalgo, México" [Amphibians and reptiles of the Mezquital Valley, Hidalgo, Mexico]. Revista Mexicana de Biodiversidad (in Spanish). 81 (3). ISSN1870-3453. Retrieved March 1, 2013.
James George Bey III (1986). A regional analysis of Toltec ceramics, Tula, Hidalgo, Mexico (PhD). Tulane University. OCLC8624401.