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https://soclaimon.wordpress.com/2013/02/18/%e0%b8%aa%e0%b8%a0%e0%b8%b2%e0%b8%9e%e0%b8%84%e0%b8%a7%e0%b8%b2%e0%b8%a1%e0%b8%8a%e0%b8%b7%e0%b9%89%e0%b8%99%e0%b9%83%e0%b8%99%e0%b8%94%e0%b8%b4%e0%b8%99%e0%b8%82%e0%b8%ad%e0%b8%87%e0%b8%9e%e0%b8%b7/
สภาพความชื้นในดินของพื้นที่ 7 แห่งในประเทศไทย