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1
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2
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3
Nurturing the soil - feeding the people an introduction to sustainable organic agriculture
Publicado em 2000Livro -
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5
Nurturing the soil - feeding the people an introduction to sustainable organic agriculture
Publicado em 1993Livro -
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8
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10
Soil organic matter; its nature, its role in soil formation and in soil fertility
Publicado em 1966Livro