“Natural characteristics as an initicial factor for a proper territorial planning in the functional area of Donostialdea-Bajo Bidasoa (Basque Country)” (2012) Boletín de la Asociación de Geógrafos Españoles [Preprint], (60). Available at: https://bage.age-geografia.com.es/ojs/index.php/bage/article/view/1523 (Accessed: 8 July 2025).