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  • Foster, John Bellamy, & Fred Magdoff (2000): "Liebig, Marx, and the Depletion of Soil Fertility: Relevance for Today's Agriculture". In: Magdoff, Fred; (xsd:string)
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  • Foster, J. B., Magdoff, F. (2000). Liebig, Marx, and the Depletion of Soil Fertility: Relevance for Today's Agriculture". In: Magdoff. (xsd:string)
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  • sowiport (xsd:string)
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