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REVENUE CONTRIBUTION THE COMMUNITY FORESTS OF Styrax spp. ON FARMERS HOUSEHOLD INCOME (Case Studies: Simarigung VillageDistric of DoloksanggulHumbang Hasundutan Regency North Sumatera). Universitas Riau [Internet]. 2017 Oct. 3 [cited 2025 Aug. 2];1(2):10-7. Available from: https://jiik.ejournal.unri.ac.id/index.php/JIIK/article/view/29