Organic materials and soil productivity - W. Flaig; B. Nagar H. Sochtig C. Tietjen (Rome Food and Agriculture Organization of the United Nations, 1977)
W. Flaig; B. Nagar; H. Sochtig & C. Tietjen: Organic materials and soil productivity. Rome. Food and Agriculture Organization of the United Nations, 1977. 92-5-100510-9 Rs. 5.10--(631.41706FLA)
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