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Organic History Origin and Evolution, Roger Bl... 

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Agronomical & Technical Issues, English, Organic Farming,

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Organic History Origin and Evolution, Roger Bl... 

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Agronomical & Technical Issues, English, Organic Farming,

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Organic History Origin and Evolution, Roger Bl... 

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The Organic Grower a history and practical gu... 

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Agronomical & Technical Issues, English, Organic Farming,

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Organic History Origin and Evolution, Roger Bl... 

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Organic Farming An International History 

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Agronomical & Technical Issues, English, Organic Farming,