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S Yasin, S Yasin and L Maira, L Maira and Yulnafatmawita, Yulnafatmawita Organic Matter Sequestration Under Coffee Plantation Based on Slope and Crop Age in Sibarasok Maninjau, West Sumatra Indonesia. In: IOP Conference Series: Earth and Environmental Science.
Welyyanti, Des Surat Tugas Mengajar Biologi Ganjil 2017/2018. Universitas Andalas. (Unpublished)
Yulnafatmawita, Yulnafatmawita and S, Yasin and E F, Kurnia and Z A, Haris Impact of Gold Mining on Physical Properties of Inceptisols in Muaro Sijunjung, West Sumatra Indonesia. In: IOP Conference Series: Earth and Environmental Science.