Defining the Optimal Ranges of Tourist Visits in UNESCO World Heritage Caves with Rock Art: The Case of El Castillo and Covalanas (Cantabria, Spain). - Fernandez-Cortes, Angel; Palacio-Perez, Eduardo; Martin-Pozas, Tamara; Cuezva, Soledad; Ontañon, Roberto; Lario, Javier; Sanchez-Moral, Sergio (Applied Sciences (2076-3417), 2025)