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631.147 --- 631.5 --- 631.151.6 --- 631.151.6 Integrated farm production systems. Sustainable agriculture --- Integrated farm production systems. Sustainable agriculture --- 631.5 Agricultural operations --- Agricultural operations --- 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 --- Environmental protection. Environmental technology --- Organic farming. --- Organic gardening.
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