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Hanafi, N. D., Tafsin, M., Hutasuhut, U., & Lubis, E. (2018). Anylisis of botanical composition and nutrient content on natural pastures in Samosir Island of Samosir Regency. IOP Conference Series: Earth and Environmental Science, 122, 012131. doi: 10.1088/1755-1315/122/1/012131