Economic value and environmental impact of Saddang River sand mining, Pinrang Regency, South Sulawesi, Indonesia by Arsyad Arsyad, Didi Rukmana, Darmawan Salman, Ilham Alimuddin, Muh. Aris Arifin, Jamaluddin Jamaluddin, Hamzah Hamzah, Eris Nurdirman, Muh. Ihsan, Ruslan Bauna, Reno Reno, Yulis Tinta

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