Alatorre, L. C., and S. Beguería. 2013. “Idenitifying Active Erosion Areas and Areas at Risk by Remote Sensing : An Example in a Badlands Landscape on Marls in Teh Central Spanish Pyrenees”. Cuadernos De Investigación Geográfica 35 (2). Logroño, SPA:171-94. https://doi.org/10.18172/cig.1217.