Nontananandh, Supakij, and Burin Changnoi. “Internet GIS, Based on USLE Modeling, for Assessment of Soil Erosion in Songkhram Watershed, Northeastern of Thailand”. Agriculture and Natural Resources 46, no. 2 (April 30, 2012): 272–282. Accessed May 5, 2024. https://li01.tci-thaijo.org/index.php/anres/article/view/242812.