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1
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1960
Naturkautschuk-heute.pdf6.jpg
Buku panduan tentang pemakaian metode polinominal bersegmen
Pusat Pengolahan Data dan Statistik Dan Fakultas Kehutanan Univ. Gajah Mada
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Jakarta
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1983
Lokakarya membudayakan kesadaran lingkungan hidup di masyarakat. Medan, 31 Jan.- 1 Peb. 1979
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Medan
USU
1979
Survey intensifikasi padi sawah musim hujan 1968/
Univ. S.U. Team Survey, Intensifikasi Padi Sawah di Sumatera Utara
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Medan
Survey Agro Ekonomi
1970
Third Nutrition Conference for Feed Manufactures
Proceedings of the Univ. of Nuttingham
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London
J. & A. Churchill
1969
Naturkautschuk - beute. Internationales Symposium, 1 April 1960
Univ. Frankfurt
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Frankfurt am Main
Inst. fur Organische Chemie der Univ. Frankfurt
1960