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1
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2
Nurturing the soil - feeding the people an introduction to sustainable organic agriculture
Veröffentlicht 2000Buch -
3
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4
Nurturing the soil - feeding the people an introduction to sustainable organic agriculture
Veröffentlicht 1993Buch -
5
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6
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7
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8
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9
Soil organic matter; its nature, its role in soil formation and in soil fertility
Veröffentlicht 1966Buch -
10