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1. Some of the world's best farmland is here (id:IND88053414)

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2. Tooling up for a new vision of earth (id:IND88053416)

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3. Classifying land for conservation farming (id:ORC00000318)

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4. Development and significance of the great soil groups of the United States (id:ORC00000562)

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5. The agricultural utilization of acid lands by means of acid-tolerant crops (id:CAT87212166)