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Agricultural systems --- Agriculture --- Research. --- 631.151.001.5 --- Farming systems research --- Agricultural research --- Farming systems --- Systems, Agricultural --- Systems, Farming --- Agricultural geography --- Farm management --- Research

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Agricultural ecology. --- Agricultural systems. --- Sustainable agriculture. --- Environmental Sciences and Forestry. Ecology --- Ecology (General). --- Agricultural ecology --- Agricultural systems --- Sustainable agriculture --- 631.151.6 --- 631.95 --- 631.151.6 Integrated farm production systems. Sustainable agriculture --- Integrated farm production systems. Sustainable agriculture --- 631.95 Agrarian ecology --- Agrarian ecology --- Low-input agriculture --- Low-input sustainable agriculture --- Lower input agriculture --- Resource-efficient agriculture --- Sustainable farming --- Agriculture --- Alternative agriculture --- Farming systems --- Systems, Agricultural --- Systems, Farming --- Agricultural geography --- Farm management --- Agroecology --- Ecology --- Permaculture --- Environmental aspects