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“KUALITAS DAMAR POHON POOTI (Hopea gregaria) BERDASARKAN UJI VISUAL, BILANGAN ASAM, DAN KADAR ABU: Quality of Pooti Dammar Resin (Hopea gregaria) Based on Visual Test, Acid Number, and Ash Content”, perennial, vol. 17, no. 1, pp. 1–4, Apr. 2021, doi: 10.24259/perennial.v17i1.12646.