Asian Development Bank1989
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N. Vorasoot ... [et al.]Faculty of Agriculture, Khon Kaen University1985
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National Commission on Agriculture, 1976Government of India, Ministry of Agriculture and Irrigation1977-
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by H.M.H. BraunRepublic of Kenya, Ministry of Agriculture and Livestock Dept., National Agricultural Laboratories, Kenya Soil Survey[1977]
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National Commission on Agriculture, 1976Government of India, Ministry of Agriculture and Irrigation1976
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