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Martínez-Graña, A.M and Goy, J.L. and González-Delgado, J.A. and Cruz, R. and Sanz, J.M. and Cimarra, C. and De Bustamante, I. (2019) 3D Virtual Itinerary in the Geological Heritage from Natural Areas in Salamanca-Ávila-Cáceres, Spain. Sustainability, 11 (1). p. 144. ISSN 2071-1050