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631.147 --- 631.147 Biotechnic, ecological farming (for alternative, intermediate and soft technology). Organic farming and farms --- Biotechnic, ecological farming (for alternative, intermediate and soft technology). Organic farming and farms --- 631.147:141.33 --- 631.147:574 --- Alternative Farming --- Organic Farming --- Organic Farming. --- Basic Sciences. Agriculture --- $?$94/07