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https://soclaimon.wordpress.com/2012/06/20/%e0%b8%a7%e0%b8%b4%e0%b8%98%e0%b8%b5%e0%b8%ad%e0%b8%99%e0%b8%b8%e0%b8%a3%e0%b8%b1%e0%b8%81%e0%b8%a9%e0%b9%8c%e0%b8%94%e0%b8%b4%e0%b8%99%e0%b9%81%e0%b8%a5%e0%b8%b0%e0%b8%99%e0%b9%89%e0%b8%b3%e0%b8%9a/
วิธีอนุรักษ์ดินและน้ำบนพื้นที่สูงอย่างยั่งยืน