Faktor sosial ekonomi yang mempengaruhi pendapatan petani da
Faktor sosial ekonomi yang mempengaruhi pendapatan petani dari usaha tani jahe di Kabupaten Simalungun, Sumatera Utara
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Policy for increasing the income of ginger planters in Kabupaten Simalungun, Sumatera Utara Province; research report.
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