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https://soclaimon.wordpress.com/2012/02/14/%e0%b8%9a%e0%b8%97%e0%b8%97%e0%b8%b5%e0%b9%88-2-%e0%b8%84%e0%b8%a7%e0%b8%b2%e0%b8%a1%e0%b8%aa%e0%b8%b1%e0%b8%a1%e0%b8%9e%e0%b8%b1%e0%b8%99%e0%b8%98%e0%b9%8c%e0%b8%82%e0%b8%ad%e0%b8%87%e0%b8%99-2/
บทที่ 2 ความสัมพันธ์ของน้ำและพืช