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Retanubun, Gery (2019) Pemanfaatan Limbah Kulit Kopi Arabika (Arabica Coffee) Dijadikan Bioetanol. Undergraduate thesis, Universitas Muhammadiyah Jember.
Retanubun, Gery (2019) Pemanfaatan Limbah Kulit Kopi Arabika (Arabica Coffee) Dijadikan Bioetanol. Undergraduate thesis, Universitas Muhammadiyah Jember.