Piyamas Wangkeeree และ Laddawan Rianthakool;Wanchai Arunpraparut. (2021) Application of Geographic Information System in the Analysis of Areas at Risk from Encroachment at the Phu KohPhu Kratae Wildlife Sanctuary, Loei Province. <i>Thai Journal of Forestry</i>, <i>40</i>(1), 34-49.Piyamas Wangkeeree และ Laddawan Rianthakool;Wanchai Arunpraparut. "Application of Geographic Information System in the Analysis of Areas at Risk from Encroachment at the Phu KohPhu Kratae Wildlife Sanctuary, Loei Province". Thai Journal of Forestry 40 (2021):34-49.Piyamas Wangkeeree และ Laddawan Rianthakool;Wanchai Arunpraparut. Application of Geographic Information System in the Analysis of Areas at Risk from Encroachment at the Phu KohPhu Kratae Wildlife Sanctuary, Loei Province. Kasetsart University:ม.ป.ท. 2021.