Assessment Erosion 3D Hazard with USLE and Surfer Tool: A Case Study of Sumani Watershed in West Sumatra Indonesia. j Trop. Soils [Internet]. 2013 Mar. 19 [cited 2025 Dec. 25];18(1):81-92. Available from: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/173