Archived from the original on 8 April 2009. Retrieved 26 March 2009. "Unidades Académicas". Archived from the original on 24 September 2010. Retrieved...
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Montiberica (in Spanish) (76): 15–24. ISSN 1138-5952. Retrieved 18 May 2022. "Unidades de paisaje: Montes de Iturrieta, Sierra de Entzia y Urbasa" (PDF). euskadi...
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