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Saragih , Elfrina and Sriyoto, Sriyoto and Basuki , Sigit Priyono (2009) PENENTUAN PERSEDIAAN PENGAMAN (SAFETY STOCK) DAN ANALISIS NILAI TAMBAH TEPUNG TAPIOKA (Studi Di PT.Bumi Sari Prima Kota Pematang Siantar Sumatera Utara). Undergraduated thesis, Fakultas Pertanian UNIB.