Gambier (Uncaria gambir Roxb.) Plant Productivity Relation Based On Growing Altitude In Lima Puluh Kota Regency. Universitas Riau [Internet]. 2023 Feb. 10 [cited 2025 Aug. 2];7(1):1-8. Available from: https://jiik.ejournal.unri.ac.id/index.php/JIIK/article/view/53