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		Asrizal, Asrizal, 		Dharmawati, Nuraeni Dwi, AND 		Purwoto, Harsunu.
" Efektivitas Rorak untuk Konservasi Tanah pada Perkebunan Kopi" <em>Jurnal BETA (Biosistem dan Teknik Pertanian)</em> [Online], Volume 10 Number 1 (27 April 2022)